I don't think that solves the problems at all. The main thing is that I don't want to have to think about how what moves I am using in battle relate back to a higher meta-game of how they affect my overall characters development.

Honestly all that it seems to add is a bigger RP connection between the actions a player takes and their job class in battle, which is fine if that is what you like. But I am not fond of RP style character development, and it is not a hallmark of the FF series either. Rather than re-inventing FF style mechanics it seems better to just look into another type of game that has similar ideas already.