I'm not sure I agree there mate. Take your example then, but go even further back to (say) Larry Holmes in the late 70's and early 80's.

Are you saying that techniques, strategies and game plans would have suddenly and quickly evolved in the 20 years between Holmes and Klitschko ..... when humans had already been boxing for thousands of years?

Average human size has certainly changed, I would agree with you there, but it's a bit arrogant of us to think previous generations were somehow less physically gifted, intelligent or capable than those people we see on HD resolution TV.

You could argue that the same mindset convinced people that dinosaurs were huge, slow, lumbering and very stupid animals that moved in slow motion ... but it seems they were not?