Quote Originally Posted by Kabooa View Post
Every 5-step mechanic / 100 gauge currently being used could just be MP based.

That's Monk, Ninja, Warrior, Samurai, Bard, Machinist, Dancer. For the most part, it's just flavor.
MP jauge refills overtime, all of those jauge don't. It would be using the MP jauge for the sake of using the UI. That proposition would be even more broken if there was still skills like mana shift or refresh around (or if they bring those skill back)

Quote Originally Posted by Shurrikhan View Post
The question is how to do it in an interesting manner, or at least not leave the MP bar just sitting their as UI waste...
And my answer is: no need to. However, what you didn't say in your original post was that last part: «MP bar just sitting their as UI waste». See, Casters had an useless TP bar (barred way back when sprint used to drained TP) and, as far as I know, there was no people asking for TP based mechanics for casters. People would just ignore it. The simplest, logical, thing would be to change MP to TP for melee jobs (just like MP change to GP for gathering classes), but I'm glad TP is gone so I'm not advocating for it's return at all.