Results of a reddit job satisfaction poll

[EaMett]

Possibly, yes. They honestly need to nerf healing across the board or make monsters hit more. It's absurd just how little healing you'll actually do outside Savage.

I personally think it has more to do with encounter design than any potency related stuff. Having predictable damage output will always yield the same result. The fact is that even ultimate fights are a meager 20% healing. And how many people can heal ultimate? You actually don't have that much freedom to play with potencies and making people heal more before it's too hard for many.
On the other end you can't change encounter design without revamping mana management and breaking all the old content. They've kinda boxed themselves into this room.