Starter healer... WHM?

[Rilifane]

WHM is a fantastic choice for dungeons because Holy is just so good but if you want to learn how to properly heal while dpsing instead of the classic "I'll just heal everyone first and then maybe dps a bit", WHM mostly teaches bad habits because its toolkit is so barebone you have to use a lot of GCD heals. Far more often and for much longer than the other two. As beginner friendly as it looks, it's actually strongest in the hands of very experienced healers and not particulary good or easy to handle for a starter healer because healing and dpsing is mutually exclusive for a long time.
If you struggle with getting rid off the GCD heal habit, WHM will shove it right back down your throat.

SCH has far less target switching than AST because your instant aoe is centered around you, not targeted. So you can just keep targeting the tank while doing your thing. It's a bit more busy and has more buttons because you have a larger toolkit but managable. It's very easy to get used to GCD dpsing and oGCD healing on SCH.
And the fairy auto heal makes it a bit more forgiving than the other two because it's like a permanent regen on (mostly) the tank.

AST is the busiest healer with frequent target switching because of Gravity being targeted but remember that while cards are good, you can gradually incorporate them as you get more used to target switching on controller. So if you fail at cards at first and card the wrong person, it's not the end of the world. Chose your battles and set your priorities correctly, then you can go for AST aswell. You'll only run into problems if you want to nail everything at once.
Just like SCH, the free weaves make it easier to practice GCD dpsing while oGCD healing and slidecasting is more forgiving. But it will require more target switching than WHM or SCH in mass pulls even if you don't focus on cards at first.

[Roeshel]

Sacred Soil is actually 600 potency since they changed ground target aoes to give an instant tick upon placing them. Which makes SS the strongest heal ingame because its 10% mitigation puts it ahead in pretty much every scenario of even Earthly Star for aoe heal and makes it comparable with Excog for ST in many cases aswell.

That's nice. I thought the ticks start 2-3 secs after placement. Can you really say it's best in the game though? Assylum gives 10% HP recovery bonus to anyone inside, so basically if the raid-wide doesn't kill you get more or less the same value from both. Assylum has a longer cd but it doesn't cost resources and lasts longer as well.

WHM is:
very immobile, by far the most immobile class in the entire game
it's very limited mobility is tied to using instants meant for healing and a dps loss outside edge cases
very few weaving slots
it's limited weaving slots mostly tied to using instants meant for healing and dps loss outside edge cases

Well... I don't think that's fair.

Whm doesn't have a lot of weaving slots because they don't have many ogds to weave. They have assize, asylum, bene, plenary and temperance. All of them have long cooldown. Divine benison and tetra are almost never used. Usually, if you really want to move or weave more than one ogcd you can just reapply your dot. Only the whm's dot deals damage when cast and I guess it's for that reason. They don't have ruin II like the SCH and 1sec time to weave and move around like AST. You can also use lilies which are the better alternative because you lose only 75 potency per lily whereas the reapplying of the dot is going to cost you 180 damage potency if more than 3 ticks are remaining.

Sch loses 90 potency every time they use Ruin II to weave their heals or move. You would have to use ED to make up for the lost potency which is going to result in you healing less. It's quite noticeable for your co-healer.

Ast is not an exception. They can lose rDPS when their party's dps is bad even if they played perfectly.

by far the lowest dps neutral aoe and ST healing potency of all 3 healers

Whm has the strongest AoE damage from all healers and there is no point arguing about it. Misery + Assize = 675 +400 = 1075 AoE potency on every mob pack except the first one and that's aside from the Holy spam which stuns targets.

Whm also has the strongest ST healing spell in the game - bene. Aside from that, if you really want to heal someone you can dish out 1900 cure potency on a target in less than 2.5s.

much lower mitigation compared to SCH

10% damage reduction is not that high, to begin with. WHM has it too. It's on 2 min cooldown but it has 30y radius. People can't stay grouped all of the time in one spot, like for example e12s Shiva's ice pillars. So WHM's temperance has its unique uses.

[Semirhage]

Divine benison and tetra are almost never used.

That's odd. They're free and up pretty often. I wonder why a WHM wouldn't use completely free, DPS-neutral recovery abilities to assist their cohealers with keeping the party up. Is it in part because they have crap weaving?

[Roeshel]

That's odd. They're free and up pretty often. I wonder why a WHM wouldn't use completely free, DPS-neutral recovery abilities to assist their cohealers with keeping the party up. Is it in part because they have crap weaving?

Because you don't need to use them. I usually save them if dps does something wrong or has stayed out of the ground aoe-s like SS and Asylum. On the first tank buster most tanks prefer to use invulnerability, so you just use benediction on your mt. The place where I use them frequently is during the 2nd and 4th tank buster because bene is on cooldown.

And yes, whm doesn't have a good weaving window. I never said otherwise. But they are not the only class suffering from dps loss when they want to weave. SCH loses dps as well.

[Semirhage]

Because you don't need to use them.

Well yeah. You don't need to use them because the other two (AST especially) have superior healing kits that handle it instead.

[Rilifane]

Usually, if you really want to move or weave more than one ogcd you can just reapply your dot.

Dps loss. A pretty chunky one at that. And you lose more than 180 potency at 3 dot ticks remaining as it costs you Glare casts over a fight.

Sch loses 90 potency every time they use Ruin II to weave their heals or move. You would have to use ED to make up for the lost potency which is going to result in you healing less. It's quite noticeable for your co-healer.

Even using every single AF for ED puts you above WHM in terms of dps neutral healing.
Which is one of the reasons why AST/ SCH is simply stronger and has the benefit of requiring less special adjustments for a healer

Ast is not an exception. They can lose rDPS when their party's dps is bad even if they played perfectly.

Which is completely besides the point because their healing is and remains dps neutral, no matter how bad that SAM over there screws up his rotation when you had just given him a card.

Whm has the strongest AoE damage from all healers and there is no point arguing about it. Misery + Assize = 675 +400 = 1075 AoE potency on every mob pack except the first one and that's aside from the Holy spam which stuns targets.

Whm also has the strongest ST healing spell in the game - bene. Aside from that, if you really want to heal someone you can dish out 1900 cure potency on a target in less than 2.5s.

Dps ST & aoe neutral healing, which is something like using Aszlum during a natural Dia refresh. Not aoe damage. Don't jump to conclusions.
It's not about "really wanting something", it's about how much you can do until you start suffering a dps loss. And that's where WHM falls behind, like it or not.
Of the 1900 cure potency, only 1200 is dps neutral if used during a Dia refresh. 1900 is already a dps loss.
This is not about how much you can do if you yolo your dps - it's about that WHM falls short when it comes to dps neutral healing, which is a direct result of the poor amount of free weaving slots and the lack of mobility compared to the other two healers.
And how much dps neutral healing a healer offers is escpecially important as long as you don't outgear content like crazy - going into fights with the party near/ full BiS doesn't make WHMs weaknesses disappear, they're just less obvious.

That's 4,290 without counting Asylum's regen. When you add it becomes 5,460 total for 24 secs and by using only 4 gcds. Obviously, in no part of the game is such fat heal needed. I just wanted to show that WHM is the straightforward healing powerhouse. The other two jobs can't achieve the same in the span of 24 seconds by using only 4 gcds to heal even if they use all of their ogcds.

A heal powerhouse is not definied by "if everything aligns perfectly, you stack everything you get, lock yourself out of dps completely, have 10s of glory nobody will ever need and then be completely drained of resources" in FFXIV.
The true healing powerhouse is AST because they have by far the highest dps neutral healing and very strong GCD healing via Synastry and Neutral, something you exclusively use for GCDs heals and is thus always ready in case you are forced to stop dpsing. Unlike e.g. Asylum which gets regulary used throughout a fight. Followed by SCH, which has immense oGCD healing potency, although a lot of it is tied to a dps loss. So 2nd place for the fairy friends.
This discussions are best done in reality, not on paper. It's about as useful as saying that WHM slaps a dummy harder than SCH or AST.

The healer class with the strongest rDPS on e9s is whm. So it is possible to deal more damage than AST and SCH. Even if they are better equipped for the encounter.

It's not.
WHM gets out-dpsed at all percentiles by both other healers on all bosses.
But the metric you really want to look at is "Healer Combined Damage" because healers don't function in a vacuum. They have a pool of resources that get used by two different players. If WHM was ahead at e9s (which it's not), AST/ SCH is still the better comp in terms of rDPS which is what really counts at the end of the day.
And the differences were far more extreme early tier when not everyone and their cat farmed Promise in near/ full BiS. Right now you have the luxury of overgeared people that have done the content for months. That sugarcoats the weaknesses it has but content wasn't balanced around outgearing it.

This is not about insulting your chosen healer class, it's about bringing weaknesses to the attention of the players and devs that the other two healers don't have or only have to a much lesser extend.
The statistics say that a lot of people play WHM. So everything is fine, right? And if you encounter a problem the other two don't encounter or only to a much lesser extend, you can just do this suboptimal thing the others don't have to do in order to achieve the same, so no problems at all, right? After all you have options.
"WHM is fine, l2p" isn't going to help here.

WHM is crazy good in level 80 dungeons with a half-decent tank because you can dump lilies between pulls and just fire away. It still needs to clip oGCDs while aoeing if Misery is not available and is very immobile during aoeing. Does it make a big difference? No, because the content is faceroll.
But it means that WHM still has these issues even in the easiest and perhaps most tailored-to-WHM content that exists in the entire game.

WHM is not garbage but is has issues that absolutely need to get adressed. Sugarcoating them won't help anyone.

I'm guilty of this because I've tried adlo spam and it doesn't help when the tanks getting trucked. I just can't keep up. Lustrate seems to hit like a wet noodle too.

Need to make up my damn mind.

But thanks for the tips. I usually saved WD for aoe damage ><

But to stay on topic:
Physick heals with a higher potency but Adlo has a shield attached to it. So even if the HP doesn't go up as far, it barely goes down at the same time which makes Adlo spam overall better.
It's generally best to use WD early into the pull when damage on tank his highest, slap the ground and Lustrate until the tank starts dropping, use Fey Illumination if available and then Adlo as much as neccessary while squeezing more ground slaps in until everything is dead.
Front loading the pull with regens and dps makes it much easier to handle because you signifcantly extend the time until you need to GCD heal at lower levels. By the time you're forced to Adlo, some mobs should already be dead.
None of the skills have crazy high healing on it's own, it's about cycling through everything and combining it for maximum benefit.

Very fair and true and the third paragraph is my fav part. May I ask about something? A friend of mine does old exs such as arr for fun no echo ilvl mini and i guess the bis for that. he state ifrit is very intense with heals but the comp is whm/ sch. I ask why not ast/sch this was probably before we got the nice mp rework and draw now gives mp back. Cause I think it was one of those reasons but or something about ast kit not good for it. am thinking cards and div is there aspected helios is there and ed and what not and medic 2 is too expensive and whm themself suffer mp issue under heavens ward things. Would a Di ast not be more viable now even in old exes like arr ones than whm?

Better late than never:
I believe the main issue is that WHM got stripped of several things with each expansion. You once had more dots for more mobility, Largesse was a huge heal buff that is now part of Temperance, BRD had refresh. I haven't played any old ex recently, so this is all theory.
The basic toolkit of both AST and WHM is the same, but AST has less MP issues from Draw and lower MP costs, more mobility and two GCDs to complement it, ED and Synastry. WHM could have higher rDPS as the diffence between their fillers is bigger at lower levels and AST can't use Div during opener for the lack of Sleeve Draw. But AST has an easier time keeping dps up and doesn't suffer from the same MP issues as WHM does pre-HW.
So I think AST should be better here aswell but I'd have to try it myself.