Basic Principles for WHM - What and what not to do.

[Parawill]

Cure II -> 650 potency @ 266 MP
Cure III -> 550 potency @ 505 MP

Whenever 2 people stand close enough and took damage worthy of a about a cure II, cure III can do the job in one GCD at lower mana cost.
It's of course situational, but I feel Cure III is getting bad reputation and is pushed into a niche spot for wrong reasons.

The usage of Cure III is situational in terms of time efficiency vs. death. In most cases when dealing with mana efficiency vs. death, there is no need to Cure III. T11 is a great example of mana efficiency (with a Scholar Fairy) as Regen + Cures (and Embrace, wont forget about 'chu Fairies) is generally enough to keep up both tanks in exception to a lolcrit or lol-vulnstack which then shifts mana efficiency to time efficiency, where your Cure III would be sublime.

Why tank again? No ones talking about the tank.

2 players got hit by around 2k damage and stand close enough -> Cure III wins in MP cost and GCDs used against 2xCure II, medica will not be enough, if you need those 2 players full asap for whatever reason.

You said 2 people in the post (granted I didn't read from post 1 to current, but it leaves room for interpretation which is where your "tanks" are coming from).

Anyways, in a situation like that it also depends on the time of the next incoming damage. For the stacking-megaflares after T13 Divebombs, I have some groups taking splash damage (avoidable damage), which forces me to Cure III since it has a 30y (+6y radius) on the stacking players. It's time efficient (and mana efficient) as you stated, but also because now you don't need to spend 798+ mana raising people :P. But yeah, Cure III has it uses. The best part about White Mage is adapting and shifting your play style to many situations.

I've shifted to two Medicas for Megaflare into Rage in some T13 groups as they don't stack efficiently enough for a Cure III!

Cure III vs Cure II
I agree with Spoekes, Cure III on two targets is generally slightly less MP AND slightly less HP rolled up in a single GCD. Obviously, once you're in the 3+ valid target range, Cure III > Cure II (though these situations tend to be rare outside of specific scenarios)

Absolutely agree.

Cure III vs Medica
Depends on the HP lose. While Medica does provide less HP it can overall be more MP efficient and generate less over heal (threat) in a single GCD. This judgement is dependent on the power of the arena sized attack and the composition of your party (you're going to have a hard time hitting ranged DPS with Cure III).

Just adding on, you need to factor in reactive times of your group and also positioning. Like you said, ranged DPS will be harder to hit with Cure III since you need to factor in whether or not they will stack (or be close) for an incoming heal. But yay for call-outs! I get to move my party like chess pieces ^_^

I use a lot of comparisons because I feel it's important for WHMs to understand their options and not get pushed into a specific answer for what can be several differing scenarios. The WHM toolkit relies on standing still and casting so a good WHM will need to understand how to make the most use out of each GCD to maximize their efficiency while matching a player's play style and minimizing overheal/threat/MP loss.

Once again, I agree. White Mages aren't static with their healing. Their tool set has a lot more utility than most people think and FCOB definitely shows the importance of adaptation for a White Mage. We get hit with healing enmity vs. tank enmity (not you Eymmi or Neo... If you read this anyways), time constraints and mana resource management. It is super fun!

I've gotten comfortable enough to be throwing Holys on Gusts in T13 too. People start laughing, but I'm practically near full-mana if everything goes 100% as planned.

And Regen is worse for Enmity generation which is why you'd only want it ticking on one target. I don't play a tank so I don't know what the general opinion is other than "Inappropriate Heal bombs = bad Healer"

Regen is amazing! I've never pulled anything off aside from needless Regens on people who could've been just topped off with passive health regen. There are times where you can just ignore healing since there can be enough time for character natural health regen to just top themselves off.

<insert Ghishlain's comment about Regen in his last paragraph because that is exactly what I would've said>