Yeah, but that's making a lot of assumptions. For example, perfect play. You never need a SMN or RDM Raise with perfect play. With adequate gear and perfect play, you shouldn't need Pots, and players should be able to clear all encounters the first time in min ilevel gear.
Yet we find in the field, that isn't the case. People often like having spares. I was in an Ex5 group earlier where someone swapped to a SMN so we'd have a third Raise to push prog. Many groups even on farm make occasional mistakes. People continue to equip better gear despite the min ilevel gear being sufficient. While healing is an either you have enough or you do not, many groups want the added comfort of having more. For progression and for early clears with a group, I often layer more shielding than I do once we have played the fight a lot and have sufficient gear to not be inches from death if a mitigation is missed.
Some Tanks do complain. And complain a lot. When we went from SB to ShB, Tanks complained about losing their agro tools, which didn't do as much damage (e.g. they were, in effect, asking to do less damage). This was as big of a bombshell with the community as the SCH and AST changes were.
To this day you can skim through any Tanking forums on this game and people wills till bemoan not having agro tools and agro management not being a part of a Tank's core identity anymore, and many Tank players complaining they feel like a "Blue DPS".
So, in fact, yes, that is happening, and has been for 4 years. Surely you're aware of it? If you've seen the legendary 0 DPS healer that runs away from enemies before using Assize, you must have seen the far more common Tank who complains about being a Blue DPS and not doing "Tank things" like managing agro and positioning bosses? It is not "Only healer" which has this split. If you'd like, I could probably find you some posts on the Tank section of this forum of Tanks complaining about not having agro (and others telling them they're dumb to complain about it), as well as on r/ffxivdiscussion and YouTube. Very much an active thing.
So are DPS players who want a more support focus and are annoyed there's not more of a Support role in FFXIV, though that's far less because they actually have options (DNC, BRD, and RDM all kind of scratch that itch to varying degrees)
GNB is kind of an exception to this rule since it was a Tank specifically designed to appeal to DPS players.
...oddly, SGE was supposed to be this for healers. I don't understand how they got it so right with GNB and so wrong with SGE, though...
once the 'Dedicated Healer' is at the point where their healing is causing big amounts of overheal, the questions come up: Do you force them to swap to a Support healer for more damage? Do you ask them to do damage when they don't need to heal (completely negating the point of them being 'the dedicated healer')?
What is your party?
Are you a 1% hardcore static party pushing world firsts and trying to set speedrun records? Then you'll ask players of ALL Roles/Jobs to switch. "I know you like WAR and it was good for the clear, but now we're pushing speed runs and you have to swap to GNB or DRK..." "I know we had you on RDM for clears and you love the rotation, but you have to swap to BLM now or get out of our one Caster spot..." The 1% do this. The rest of the community doesn't.
If I'm on SCH or SGE and my FC asks me to sub in for one of the statics and I join and see the other Healer is a SCH or SGE, I swap over to WHM. If it's WHM, I swap to SCH or SGE.
You can ask your party to do whatever you want, and depending on if your static/friends group are hardcore min-maxers and meta-chasers or just a group of friends where most only have one 90 (or one geared one, anyway), you kind of make do with what you have. So the answer to this question depends on your group.
I've long noted min-maxers are going to min-max. It's what they do. The price for min-maxing is you don't always play what you "like", you play what the meta is. And this is true regardless of Role. As noted, MCH's were asked to change. PLD/WARs were asked to change. RDMs were asked to change. RPRs were asked to change. And even in the healer role, WHMs and sometimes ASTs and SGEs were asked to change. This is no different than the current live game.
As I noted before, at its worst, this paradigm produces no worse results than what we have today with the live game.
If it's possible to remove some healing GCDs from their load, by having the Support healer throw out some occasional heals like Indom or such (tools they would need to have, in order to get through solo-healer content like a 4man dungeon), then the Dedicated healer does what with the newly freed up GCDs?
Whatever they feel like, honestly.
If the party is doing risky things, they may use healing or mitigations. If everyone's on the ball, they can Glarespam with ease, fluidly moving back to healing as soon as the damage picks up again. An Ex5 party I had earlier the BLM consistently was ploping his Ley Lines just far enough away from the boss he was outside of my Assize. Well, I devoted a few GCDs to keeping him alive. If I didn't, he'd die. (BLM's always been a "healers adjust" Job, and "adjusting" with GCDs if it increases their damage contribution is better for the party anyway, to a point.)
So not necessarily damage, but if they do some 1 button spam damage (you know, they kind they already have to do today? Again, this is no worse than what we already have live...), where's the problem here? They aren't going to get "bored" since they aren't the Support/Damage oriented Healer, that's their co-healer. Who is getting to do more damage as healing needs are less with fight practice and better gear. Everyone wins here. As I said above, Dedicated Healer archetype people aren't opposed to pressing damage buttons. They're opposed to their mental energy having to be expended on damage rotations instead of healing needs and boss mechanics. That is, their enjoyment of the game comes from boss mechanics and managing party health and mitigation, not performing an "exciting" and "fun" rotation. To them, 1 button spam as their filler isn't just acceptable, it's what they'd prefer to the alternative.
So, here's the kicker: with this idea, the point of failure
No, it remains unchanged from today. Overall, because mitigation abilities don't JUST exist on Healer Jobs (and Healer Jobs don't have enough of them for min ilevel or near min ilevel runs), it's a party-wide responsibility. You can argue people would blame the healer instead of the DPS who didn't use Feint...
...but they already do that today. Again,
at its worst this idea is no worse than what we have live right now.
But all in all it sounds like a design being written for a FFXIV that doesn't exist, and cannot exist, because people have formed a perception of how it plays.
Who?
This is literally how the game is played in high end speedruns
now. How little pure healing can we get away with? Can we swap to SCH/AST? Can we solo WHM (or AST) heal so we can swap in another DPS? People were doing this in SB, ShB, and EW, as well as obviously in HW and ARR, where the paradigm was pioneered.
And for casual content, where a single healer can already provide for a 24 man party without needing a co-healer
in live, this would be no different than it is today. Right now you can solo heal 24 mans if your party are doing the mechanics correctly. At that level of tuning, it doesn't matter if you get the good party with the meta SGE/AST healers or if you get stuck with the SGE/SGE or WHM/WHM party who can't even get Atamos platforms right.
The only thing that would need to be "changed" is for the Support based Healers to have more Support functionality and the Dedicated ones to have tools for sustained healing. Right now you can go into Ex3 and probably have one healer solo heal it with the other as just an emergency backup. People were solo healing ZodEx in 6.0. In 6.0, "selfish" WHM Glarespam was considered a liability to their party if they were doing actual healing, so (in an odd twist on this paradigm), their co-healer was basically solo-healing P1-4S with the WHM just doing support and suplemental healing with their oGCDs. The high damage bleeds are far more easily handled by having your WHM or AST use HoTs on the afflicted party members with additional support from your SCH/SGE's oGCD supporting heals.
There's no "the game can't do this" because the game is, quite frankly,
already functioning this way in all but name, and has for 2 Savage raid tiers (unintentionally or otherwise) and 4 patches worth of Extremes now.
Over 8 years of 'healers need to pump as much damage as possible' is not going to be undone.
Well, first off, not 8 years, but that aside - as I noted above, it's already been undone.
Even if the gameplay is changed to try and enforce one healer to be 'the HPS bot' and one to be 'on standby to spotheal', people in this game will find ways to try to reduce the GCDs used by HPSBot, so they can do damage too.
Some will.
...and we'll be no worse than we are today. Again, at its worst, this idea is equal to the present day. "But the Dedicated Healer might have some people play it where they cast Glare" isn't much of a counter when that's...what we have right now. If the "worse off" argument is "things will be like today", then that means this is already a better paradigm.
if SupportHealer is able to heal through the EX roulette (and they'd have to be able to by design), HPSBot Healer's HPS is going to be redundant.
Sure, but roulette doesn't work by letting you pick your party members from a pool. You get stuck with what you get, just like now. Again, this is no worse than the game is right now...
So while I can appreciate the sentiment behind the idea, I think it's just not feasible in execution.