Clown thread this. Anyone who plays tennis knows it's harder to hit a higher bouncing ball with a 1BH.
To draw conclusions from a practise video where Kohlschrieber is about 6 feet behind the baseline looping backhands and say a 2 hander couldn't do that doesn't make sense.
2 handers aren't going to need to wait for the ball to bounce like that anyway because it's easier to lean and take the ball on the rise. Next.
Federer the undisputed GOAT.