Your comparison is too over exaggerated to get the point across. A better one would've been:"-or beating someone in chess because they got sick on the spot?"
My point? Extreme exaggerations don't get your point across.
My thoughts lie in line with battousaiJoe's, if you can't win without all the items off, then you can't call yourself the best.
The best players can adapt to situations depending on many different factors, including the inclusion of items. They may be an X factor, but you deal with X factors on a daily basis in your life, and like your life, you have to adapt to those X factors to function normally.
The same can be said for games like Brawl.
So, in gist.
"If you can't handle the X Factor, you can't call yourself the best."