Quote Originally Posted by EnigmaticDodo View Post
Healers have a instant casts. You're allowed to let them dip a little low then instantly top them off when need be.
Instant casts should be saved for emergencies when they're actually needed, not wasted over misunderstood priority or outright laziness.

Quote Originally Posted by PyurBlue View Post
Healing is the priority, you just don't need to heal until you need to heal. The only reason to keep party HP high would be because you as the healer don't know when damage is incoming. If you do know damage is incoming, then it's very easy to leave party members below 50%. This also saves you MP and allows you to DPS more to further reduce damage.
DPS below 50%? Sure, but not the person taking all the abuse. It's people like this that make me feel unsafe tanking as anything other than PLD. I've died far too many times as the other three due to negligence to ever risk it again.