On a semi-related note, when did sleeper holds fall out of use and just become rear naked chokes? It used to be that chokes were illegal but now everyone is doing them. It no doubt happened because MMA grew in popularity, but I wasn't watching pro wrestling between the early 2000s and about 2016 so missed that transition. I'd guess it just happened quietly, as if chokes were always legal, or was there ever any kind of mention of that?
I've also noticed that WWE go out of their way to put silly names on chokes to make them not sound like chokes.
On tapping out, was that not always in use? I'd guess it's another thing which become more prominent because of MMA as opposed to verbal submissions and also become more definitive rather than a ref's discretion kind of thing.
Bret also tapped out against Owen in their famous Wrestlemania X match (at about 19:56):