How Could We Make Meaningful Use of MP?

[HumanNinjaToo]

And... to Monk, Dragoon, Samurai, Bard, Machinist, and Warrior?

The point of this thread is not whether MP is occasionally useful at present for some jobs. It's for suggestions on how to make it a meaningful mechanic for every job.

I’m struggling to come up with a meaningful reason why any of those other jobs need to use MP to begin with, let alone how to incorporate MP costs into their kit. The ones I’ve played seem to function fine without MP; if it ain’t broke don’t fix it.