Whenever I read articles railing against single founders, I usually assume the person writing the article doesn't have a meaningful amount of single-founder experience. This makes me question their reasons given to not be a single founder.

I'm sure some of these reasons should actually be carefully considered before deciding to go it alone, but I feel that many of them can be safely ignored given one's appetite for risk. After all, if you aren't willing to take chances, why are you trying your hand at a startup in the first place?

tl;dr - Of the common assertions against being a single founder, which are myth/overblown and which are serious concerns?