I prefer to play healer when doing duty for the first time. You have to be on your toes and prepared for anything. Especially in new alliance raid :) It feels so good to push through chaos and survive.
When I played healer in other games, I liked that I spent 80% of my time healing. It's the reverse in FFXIV, 80% DPSing & 30% healing.
If they want healers to heal more, design encounters around that, if not, then give them a proper DPS kit.
