If the perception of WHM is that it has the least buttons in the game, but the data shows that it actually has middle of the pack numbers...

Surely the issue is that WHM 'feels' like it has the least, due to how much redundancy is in the kit? Cure 1, Medica 1, Regen to an extent, half the role actions, can all be removed from the hotbars and you'd never notice in 99% of the game, I think that's the real issue for the class

Other healers, it's kinda the same deal in some regards. I'd say SCH is the one that bucks the trend, as the only thing I can come up with for consolidation that doesn't lose some of the 'versatility' of the class is making Physick upgrade into Adlo. SGE would be atrocious without Eukrasia, but at the same time, it's only used on three buttons.