This Idea would make me happy with the Job System (FFT Traits)

[Zantetsuken]

However I like in FFT where jobs would get unlocked when you reach certain levels in multiple classes like lvl 4 THF, lvl 4 MNK, LVL 4 WAR (or something along those lines) would unlock the NIN job.

I proposed this exact idea here. It would have been a perfect replacement for the armory system.