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

[Absurdity]

Healers in this game have access to far too much spamable Aoe healing. It really dumbs down the job. More dps abilities along with aoe heals on a reasonable CD would go a long way imo.

You'll most likely never see a nerf to spammable GCD aoe heals. Simply because it would increase the difficulty of basic content for any healer that hasn't memorized incoming damage yet, something I don't see SE doing, and because it would mean your average cure bot would have to actually plan out their aoe healing, something I also don't see SE ever doing.