How would they even make another healer job though?

[Eloah]

Make the Mix system work like the mudras so certain combinations do certain things, and "lock" each button after using it once in order to prevent failed mixes.

See, that's what I think, and when I even was making a concept, that is what I went with as well. But, one would think, that was the system they initially had as well, but we can't say for certain. But maybe with the revamped Mudras system there is hope. My guess is that it would work like the dances in that we'd have two commands to use, Mix for heals and Compounding for attacks.