Don't really see why it shouldn't be a thing.


Brainless 1-2-3 basic combo vs brainless single button spam for a 3-combo attack, they are basically the same, but the latter save you two slots and potentially more depending on classes, like Dragoon has a lot of combo buttons.



Not all classes need this though. Monk, for example, have unique combo system where their attacks are interchange-able, so it would be better to keep their combo button seperately.