Started thinking about it and there really are several instances where a sport "adjusts" based on the "height" of the player. The most notable would probably be blocking rules in NFL - do not have the wording but I assume the rules incorporate the player's body parts as a reference (below the waist, below the knees, etc). Going in a little different direction, look at boxing. Why doesn't top level boxing just let all folks participate? I assume anyone can box heavyweight, but why bother with all those lower classifications? I personally think the NBA should institute a cumulative height maximum on the court at any time - maybe 32.5 feet so the average is 6' 6" - would really give a boost to some short point guards.