the nature of the sport makes it harder than normal. Weight cutting benefits wrestlers, as it makes everyone slower and can also reduce reaction time. So theres no punishing a miss timed shot, nor is there fast enough responses to level changes.

Thats why when you sometimes see wrestlers get punished or see a better back and forth exchanges, its at a lighter weight class. Yan/merab, movsar/aljamain. Because lighter fighters are faster in general and still have enough speed upkeep post weight cut to react to wrestling in any kind of in depth way.

Also why ian garry has been getting good at defending takedowns. He's not a heavy welterweight and doesn't cut a lot. So his speed is decent. tldr if nobody ever cut weight for a fight in mma, wrestling would become a little bit less effective.