The biggest issue with all the healers right now is that the devs's 'intended design' is completely at odds with actual gameplay.

They removed and simplified DPS and cards while adding a lot of healing abilities. That clearly says they want more healing and less DPSing, but they didn't change the battle system or fight mechanics to support that play style. Healing is still incredibly strong and incoming damage is still incredibly predictable. Outside of doing huge pulls in dungeons, nothing requires that much healing. We still spend most of our time DPSing, it's just more boring now.