This is an okay suggestion but:
1. Cure III is wonk targeting already and hard to gauge what it will hit, very niche use cases unless targeting yourself. Can we have the targeting of holy be in addition to how holy works now? (So when nontargeting it'd just go off as normal)
2a. Unfortunately it seems they are going from procs but this is a nice idea.
2b. That would less uninspired vs 2a.
3. Eh, I'd rather not want this, because it would upset presence of mind timing (I can get a holy in every second) unless it can be worked in.
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I'd rather also them cut down on already existing button bloat for unique answering:
If it exists and does not need to exist, it shouldn't.
If there is a better skill that feels like an upgrade, that skill need not be duplicated. (Cure>Cure2) I've seen many persons cast these tier spells in higher content even so much so as 80+ as the tank.
Buttons worth removing in terms of evolution via from whm IMO:
Cure>Cure II and maybe even > Under Temperance and Presence of Mind changes Cure II > Cure III (so Cure III becomes more intuitive. Can make it the same potency as it has a cost to use now.)
Medica> Medica II
Aquaveil > Divine Benison (also absorbs Aquaveils effect)
Plenary Indulgence > Temperance (increase in heal potency)
(an outlier) Tetragrammation > Afflatus Solace (but now oGcD and only Solace, Rapture still GCD).
That's six button slots for unique actions in whm alone. Some being damage, some being unique to some new use case.
(I think people could even cut it down further but this would be a start)