I remember when Sandler was on Norm Macdonald's podcast years ago. Norm kept asking him why he wouldn't do stand-up, he kept dodging the question and eventually admitted he can't.
I didn't know what to make of it at the time, but now it's obvious. Stand-up comedy is an inherently personal and renegade form of art. You stand under a light in front of a room full of strangers and attempt to make them laugh with what you think is funny, (a tall order.)
Without the massive structure of the Jewish "entertainment" industry, these kikes stand no chance at amusing anyone on their own.