Like TP before it in the old days of Stormblood, MP is starting to get less and less meaningful.
MP party resource management has been axed out of the game, which means that the only ones that can still regen their MP are casters on their own with Lucid and Piety. This means that rotations can't be MP negative/neutral anymore, and if they are, some piety melds will be required.
Dying is the only thing that can threaten healing, and raises are still what mostly justifies MP to this day. Even a dead healer can recover pretty easily because healing is mostly located on the OGCD free side of their toolkit, and GCD heals aren't that expensive unless one is literally resorting to pump Cure 3 / Medica again and again. On top of it, we get more and more OGCD heals, and tanks are literally getting immortal while other roles get buffs in mitigation and even faster swiftcast for even more insta raises just in case.
On top of it in content like Criterion, raises have been moved to a Duty Action for everyone to prevent a healer death to lead to an immediate wipe and force people to bring a SMN or a RDM. But this comes at the cost of making MP even less relevant.
In recent days I've gotten to play a bit of Blue Mage in content to get remaining spells and/or fill my log, and it's been an actual shock to go back to a system that predates ShB a little. Why? Because while the basic heals, or tank mitigation spells cost little like most job toolkits in pve right now, the actual big ones like White Wind and Diamondback, which are definitely needed considering how squishy BLU can be, cost actually a steep amount of 1500 or 3000, and diamondback comes with actual heavy constraints as well. Angel's Whisper also has a crazy long cast time and recast. All of this makes you actually consider when to use your biggest resources tactically, for that they come with heavy costs, and therefore create management play.
In comparison, everything in the current pve model is slowly losing MP's significance, and while I don't see SE actually removing MP since it's just a staple of Final Fantasy (although some FFs dont use MP...), I feel like i'ts slowly turning into a glorified resources, except for jobs which still bake it into their mechanics (BLM, DRK).