I heard on a podcast that a lot of college and freestyle wrestlers who go pro are usually pretty good about #1 and not getting injured themselves, but struggle with basic stuff like not having your back towards the camera during a move and slowing the pace of the action (not trying to do too much too quickly) so the audience can take it in and react. Not willing to put guys over makes sense too. That, and having the charisma to sell their persona which is a big challenge for all pro wrestlers.
I'm not sure if the problem is Gable or the way WWE is developing pro wrestlers. Didn't Angle go through a long process learning all this stuff before making his debut on TV? Now it's more of a sink or swim model and Gable will need to figure things out quickly.
Seems like a lot of WWE fans are hating on Gable. Why doesn't he lean into that and go full heel, make them really despise him? That would give him immediate attention and jumpstart his pro wrestling persona. Maybe he's already doing that, idk because I don't keep up with WWE.