I beg to differ....
We pronate for serves and forehands, and do so with a twist of the forearm, NOT a bending of the wrist. "Layback" of the wrist is a result of a relaxed grip and forearms, NOT a conscious effort on any muscle.
Differerent sport and equipement.
Golf, ball don't move.
Baseball, don't matter so much which face of the bat is pointing where....yes, I know, a bat is stronger along the grain, but that is a wide sweetspot, compared to the face angle of a tennis racket.