The problem is, this kind of auto combo system would not work for most jobs. Right now, considering the current rotations, the only jobs that would benefit from this change are DRG, NIN, SAM and the 3 tanks. I'm willingly leaving out mch because they can't merge the 3 basic shots without significantly changing how MHC play right now. Anyway, DRG would gain 6 slots, SAM 3 and NIN 2. So in the end, DRG is the only job for which such a system would really make a difference. And it's not like we need more hotbar space, there's plenty of it right now. It might become a problem in the future, but I really hope they won't implement something like this unless they decide to give us more combos and more ogcd .