Curiously, how do you know healers are the least played role? I know for myself I used to always play both a healer and a tank, recently changing to DPS and a healer with tank as the back role for Endwalker. And please don't list something silly like Lucky Bancho as the metric, since last I checked they base it on weapon item level, and while many easily have 530 gear now at 80, even back in ShB people oddly were mostly Augmented Exarchic for the casual populace.
I know on Sage at least, no MP issues at all. Stuck to the same mantra I've had since ShB of popping Lucid at 7k. And SGE has "MP issues" if they don't want to "waste their Addersgall", yet never experienced it so far.
