BP, I am not disagreeing with you that there is a grip change. Many pro players start out yooung with old school grips. Eastern and a mild Eastern backhand grip. They learn to turn the racquet back and forth between grips changes a certain way. Over time this gets engrained. When a player moves to more extreme grips, players are still accustomed to turn the racquet a certain way for their grips change. They also get real fast at it. You can technically change your grip faster than you can say "boo". However, all of this does not mean that the area of grip changes can't be rethought. The word "fundamental" got to me a bit because it is more traditional because of the way people learn tennis then it is a fundamental of tennis. In fact, if you think about it, it would be be much more advantageous is a player didnt have to switch grips and could simply hit on the same side of the racquet. The other area of "concern" was your racquet would warp. Or it would wear out improperly. I have no clue how this came about and have no idea whether there is any scientific evidence that proves this out let alone whether it is material or significant. Who knows! The bottom-line? It is up to the player.