I like MP as a concept but it doesn't really function well at the moment. Healers, who have a priority to heal, shouldn't be worried about managing their MP to do so. It makes sense for MP to be a restriction on DPS classes that limits how many revives they can do but Healers should be the opposite in my opinion. A newly revived healer should still have all there healing at their disposal free of cost but lose access to MP needed for DPS. If they really wanna make healing approachable that would be the way to do it. Give each healer a unique DPS rotation with clear priorities and incentives to use their MP on spells with varying cost. Let each healer have a unique way to Regen MP as well. AST card draws, SCH Aetherflow and Energy Drain, Sage with Addersgall usage, and WHM with actual MP return on Lily Abilities. We could have really interesting DPS kits that utilize our MP in interesting ways adding the depth we are sorely missing while allowing causal healers to always be up to the task of keeping the party alive.

In my ideal world Lucid Dreaming wouldn't exist at all for healers.