I see so many players who have nice strokes and hit the ball nice and hard - but they have zero creativity, they hit the same shots the same speed, the same height over the net, EVERY SINGLE TIME. They keep trying to hit the ball the same way every time thinking hoping that one day all their shots will eventually fall in. But it never happens. These are all smart people too, but they play stupid tennis. You have to have variety and trickery to win. You have to mix it up, hit slow balls, high balls, deep balls, short balls, diff spins, you have to push, give no pace, put the opponent in places on the court he doesn't like to be, make him generate pace if he doesn't like to on his own. It's confounding how many intelligent people out there play such dumb tennis. Adding pushing to their reportoire would make them more complete players with extra dimensions to their games. The more weapons in your arsenal, the more methods you have to win points, the better player you will be.