Why?

[Miradelle]

Big cope coming from a white mage main, your job will make casual content slog. Try playing more jobs before you start reflecting on the usual players.

Isn't WHM the highest damage healer, because you can spend lilies between pulls and get blood lilies for packs?

Also, from my experience, it's usually the healer damage that really makes a difference, since a lot of healers barely do damage. DPS are always focused on doing damage, tanks mostly focused on doing damage, but healers often spend more GCDs on healing than you need to--or in general just being more scared of dying.