There is another problem too, though: if my 20th level, 20 STR fighter can't be as good as any real world champion athlete then I will probably suck in comparison to Aragorn, Conan, Beowulf, Hercules, Batman, Green Arrow, Hawkeye etc.
I also find it spoils verisimilitude that fighters are capable of fighting at a physical level that surpasses the humanly possible (eg trading blows with storm giants) but lack comparably preternatural physical prowess in their non-combat endeavours.
And this was the whole point of the thread. Weird (and depressing) that this wasn't most people's takeaway.