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

[Imora]

AST doesn't suffer from Healer downtime as much as WHM and SCH. They get their own minigame in-between damage and healing. The other two though definitely need something to fill their downtime beyond one-button spam.

I don't have anything set up for WHM since I don't have it unlocked yet, so I can't say anything about that.

But while I understand one button spam is boring, I'd rather see them make GCD heals needed more often than add more buttons.