People who think Nadal's shots are all 100% natural talent. Guess what? He has the most unnatural shots I've ever seen.
Unnatural is subjective. Even if everyone agreed his shots were unnatural, I don't see why an unnatural shot could not be created by talent.
Shots that curve outside the doubles alley and then curve back into the singles line? Come on, that's completely unnatural and he's only able to do that thanks to his modern racquet and poly strings!
He is talented enough to pull off shots that no one else can. He isn't the only one using those strings.
If Nadal and Federer had played all of their matches with both using only 65 sq. in. wood racquets with the standard 18x20 pattern strung with full natural gut (about as natural of a set up as you can get sans playing bare handed), I can guarantee that Federer would be way ahead of Nadal in their H2H. Heck, I'd be surprised if Nadal was able to win even a single match, even on clay!
Who cares? How is this relevant? If you forced one player to make a major switch and another to make a less major switch, of course the player making the bigger switch would be affected more.