You all think sub-jobs was a missed opportunity?
Like you can have Machinist have a sub-weapon and become a Corsair or Cannoneer
Astrologian with Geomancer
Warrior with Berserker
Black Mage with Magic Knight
Dragoon sharing skills with Machinist (Like Edgar from FF6, it was simply called Machinist though in that game)
Paladin having a DPS sub-job called Templar from FFT
So on, so on.
They would all share the same weaponskills, but some skills being exclusive.
I know its been talked about before, but its fun to think about what could have been. :o