Most men are so strong that they can still hit the ball hard and play with heavy topspin, it is much tougher to return a 90mph heavy topspin shot which will literally take your arm off if you aren't in the right position rather than returning a 90mph flat shot. So most players don't need it. Simon is one of the main hitters and its no surpise because of how thin he is. Women are 9/10 flat ball strikers because their bodies aren't strong enough to put heavy topspin on the ball and still make it move fast, its got nothing to do with ballbashing. Trust me, if every woman tried to play like the men, the WTA would rewind back 20 years to when it was just a bunch of moonballers.