You don’t have to hit a baseball 400 feet to be a successful hitter… Also, a perfect game would be much more difficult to accomplish than hitting a home-run, and that is in baseball alone.
At the risk of throwing more fuel on the Wilt is god/dog debate and deviating further off topic I submit that much of the perceived athleticism in today’s bigger men is a result of rule enforcement and not rule changes. Fouls are given away for minor infraction and a ‘legit’ foul from the pre-Jordan era will certainly be ruled flagrant and may even get a player suspended.
Maintaining your pivot foot, dribbling the ball with one hand from the top half of it, and taking only two steps with the ball were all once hard and fast rules, now they are merely suggestions. Players seem even more athletic because they are able to utilize these rule changes to attack the basket from more advantageous positions than in previous eras. Big men don’t go up and under (‘The McHale’) because they don’t have to.
If you want to judge Wilt’s athleticism and vertical he won the Big Eight Conference championship in high jump at 6’6’ about seven inches shy of the world record at the time. This was before the Fosbury Flop meaning that he had to get his belly button to about that height to clear the bar. Pretty impressive. He was also very strong. He was not, as was previously believed by his employer, strong enough to defeat Conan 1 on 1 leading to the unfortunate and unnecessary destruction of Shadazar by the partially arisen god Dagoth. But he was still pretty strong.