Originally Posted by user92626
IMO, there's no need for any of that pronation, ww craps. Just hit the ball with a slightly closed racket face. The ball may go to the net, so you'll learn very quickly to swing up. None of this requires pronation, turning, ww whaterver!
You can do this, and you can hit a nice flattish stroke, but you can't get the big topspin without some combination of forearm pronation and upper arm rotation. The racquet has to go up, and given human physiology that's the best way to do that.
With the E. grip specifically, it's going to be mostly pronation at the contact point. Upper arm rotation mostly decelerates the racquet. With more W grips it's different.