Intuitively, that'd make sense if that unsuccessful person eventually found success, otherwise who knows if they actually picked up what made them unsuccessful in the first place?

I think it's reasonably common for people to understand what makes them unsuccessful but be unable or unwilling to resolve the problem.

For me, I know that one major reason for putting an upper limit on my success is my inability to form effective professional relationships. I know I should go to events and talk to people and use these relationships to my advantage, but that's just not something I've ever been good at, and I find it so incredibly unpleasant that I also just don't want to do it.