Re: How about a Superman that can't fly?
If he were jumping skyscrapers, he'd be making huge, arbitrary craters with every landing. It just wouldn't be credible.
Anytime he fights a villain, multiple skyscrapers come crashing to the ground and Metropolis ends up riddled in craters, so I don't think it makes a difference one way or the other.
"Divine intervention is unlikely." - The Doctor