The relative uselessness of CC has a lot to do with how easy most content is. Square doesn't want to scare people off with content they can't clear, so they tune it pretty low. Low tuned content means small mistakes don't impact you. If small mistakes don't impact you, then why put a powerful enemy to sleep? Just kill them. Sleep is a waste of time if there's no threat.

What I'm saying is, you can't have good CC or 4D debuff chess unless you have content difficult enough to warrant it.