I would actually put MP management pretty high on the problems of healers because it’s literally a zero sum game, you know exactly how much MP every healer will get for the length of the fight and you know exactly how much damage is coming out so you know exactly how many (if any) GCD’s will be going towards GCD healing so you know what your MP drain is and you just counter that with the correct level of piety, the only thing that messes this is up is raise

On top of that is the fact that besides SGE it’s a DPS gain to do what generates mana for each healer (aetherflow/lilys/cards/dyne) and SGE it’s totally DPS neutral so there is never any sort of choice with mana generation

If generating MP was something that required skill (using an extremely basic example let’s say if you keep your DOT up for more than 45 seconds then each tick after that 45 seconds generates 300 MP) then you could tailor your skill level to your piety level to give you more expression in how you generate DPS rather than the current “well it’s a DPS and healing gain to press aetherflow so why wouldn’t I press it, the MP is just an added extra”