It seems that Isner and Raonic would have done better in the 90s era than today, where they have to be able to win a decent number of baseline rallies.
The regression analysis in Section 9 shows that weight is also important in determining performance, and that being taller without having the right weight can be detrimental. This suggests a type of optimal physique, a combination of weight and height that works well together. It makes me wonder if the optimal physique has changed over the years.
If I have some time I'll see if I can find the optimal weight given a certain height, then compare those predictions with actual top pros.