Federer is doing the best job of hitting that shot which has ever been done but it’s still an inefficient shot, sort of like lifting a stone instead of using a lever; he’s moving his arm one foot to move the racket head one foot. Again I have no picture of anybody exploiting that on grass.
As a former Top 20 North Carolina junior and one who hashed a 2-handed backhand before switching to a 1-handed you are WRONG.
I hit the ball harder on my backhand than the vast majority of my 2-handed opponents.
There is a reason the bet players of all time used a 1-handed backhand ya know.
The 1- handed is the most versatile and dangerous stroke in tennis.