I was just thinking about this the other day! I realized (and somehow didn't notice before...) that a big difference between 11 and 14 is that you had access to all of your job's abilities/spells at once in 11 (BLU excluded, of course). Perhaps taking away AP cost for your current class, while keeping it for equipping outside abilities/spells would be more interesting/useful, especially if they're breaking up single/AoE spells.