Why is the healer class basically a one spell dps class?

[Acece]

I think they wanted to mimic WoW, healers in wow mostly heal with some utility. The problem is even in Wow, healing classes still have a pretty decent (holy priest) to robust dps (disc priest) rotation even when in WoW they heal way more. Healers also in ffxiv has no utility/uniqueness that makes them worth while from each other so you can take any of them.
Honestly I think they miss the forest for the trees, while they get the general idea of pure healers/shield healers they don't get why they work so they just dump a bunch of none interacting healing with little to no healing requirements while also not giving healers a satisfying dps rotation to make up for it.