>>7335545He's keeping the kayfabe alive, it's not about if you can do it or not is about if you should be doing it or not.
Even if Keith Lee can do a moonsault doesn't mean he should be doing it every single match because when some smaller wrestler do it, it lose impact and make the fans expecting something else and that push the wrestlers to make more risky things to please the mark fans.
TL;DR Even if you can do it, don't do it because you need to keep some moves special and coherent
(i'm not saying Jim is right or not, just explaining his point)