First off, that is a pretty rude punk a** reply...then again I don't respond to these post much because I find most of you guys to be blow hards.
This old coot should realize that just about every pro except the enigma (Nadal) uses 12oz. plus racquets, so what the hell is he talking about? Basically this is what he is saying...the game is too fast, so tennis is too hard on your body, and he for some strange reason is focused on the racquets? The pros rarely actually use anything designed or made in the past 5 years...Paint Job oldies but goodies dominate the ranks.
Gains in athleticism, fitness, and strength are the reasons the game is so physically grueling...these guys would hit a rocket ball with anything, it is just in the modern game their opponents have the speed and strength to actually get to it!