I guess my world building question is if everyone can do the outstanding stuff, or does it take a spark? (Demi-god, touched by fate, whatever). How many of the heroes in the 2000-2020 inspirational fiction that go way beyond IRL physical feats have something special in their origin and how many don't? I have no idea! (Percy Jackson certainly has special stuff backing him up).
In the comics are Natasha, Clint, and Bruce the limits of mere-mortalhood? Does it cheapen Cap and Black Panther and Beast's accomplishments that they're souped-up or a mutant?
What makes it feel odd to some if the Uber martial needs to be touched by fate, dipped in the river Styx, a demi-god, tap into the morphing grid, or... whatever? Is it that the desire to zero-to-hero doesn't work if you were never a true zero? Is it wanting to see ourselves as being able to do it? Is it that they don't have that supernatural specialness in the inspirational literature (is much of Wuxia like that or does that have a source of power too)?