I wish resource management was its own little mini-game apart from damage rotations. I agree that if Lucid Dreaming was replaced with MP being slapped on buttons you press anyways, then there's really not much added.

For example, RDM purposefully unbalancing their White/Black Mana to get access to a special sword combo that deals less damage than standard but regenerates more MP. WHM entering some Cleric Stance kind of mode that reduces their healing potency significantly but their damage spells become MP positive. AST having the Ewer card of course. BRD having a song that only grants MP regen to party members. SCH with Energy Drain, or maybe Selene's usage of the Fey Gauge.

We could also tie some melee jobs' actions to MP, like Ninjutsu costing half of the MP bar instead of being on charges, or the old 'Fists of' stances constantly draining MP, or even just generic oGCDs like Equilibrium. I think things like that could encourage more job interactions with each other and feel fun.