Originally Posted by treblings
i heard an interview with Janko Tipsarevic where he stated, that the top pros clear the net higher than say youngsters at the futures level, who tend to hit as hard but generally lower over the net.
I heard him say it on this video where he's giving advice to a former Junior Wimbledon champion. https://www.youtube.com/watch?v=2AULbt7ZjcU
The examples the OP gave with video are I think a little misleading because more net clearance is normally hit on clay.
But there is probably a lot of truth the the claim that the bigger shots of the top 100 pros today are hit with more topspin than even among good college players. That would tend to mean fewer misses into the net along with more overall consistency. Overall consistency is probably a big factor, even among the wild top 50 players like Tsonga and Dolgopolov.