Okay, fair enough, but I'm still left wondering what niche that style of play actually fills. For White Mage to not be required in any content, content cannot deal out so much damage as to make high raw healing potency required. Which means the only way to make that potency uniquely useful is for
the players to repeatedly take avoidable damage and/or tank the floor. Is that interesting? Can that be made interesting? (I don't have the answer.)
I could see White Mage leaning into a GCD-based, cast-times style of play, though. I mean, it already does. It's just not satisfying when the healing kit is so heavily biased towards "restore HP" and the DPS kit is… well, what I've been doing since I was a Lv.1 CNJ

.