Our teachers often said that there's always room to improve, but they'll also have to admit that there are times when they legitimately can't think of any.
And when that happens, I'd say that we're well within our rights to throw up the finger guns and slide on out of there before anyone thinks of a way to chip away at our perfect score.
I say all of that to say that maybe future generations will figure out how the people on this list could've done what they did better, but they all get a perfect 10 as far as I'm concerned.