I never said what the limit break would be. It could be any number of things, not just "another cooldown that deals, mitigates, or heals damage".

This game is all about its aesthetic, because it's not exactly breaking boundaries on a mechanical level. Whatever criteria you set, the Limit Break has for quite some time been a defining cinematic moment in the Final Fantasy franchise, and as it stands, a good portion of what's available is never used.