This is certainly true for themselves. I wonder, though, what other people (who did not go through exactly the same hell) can do with that story other than shrug their shoulders and move on.
I can answer that. First I should clarify something. People with the kind of background I described (the starting independently part, btw, is not necessarily "hell"), will not be presenting themselves as "Hey, I had some rough spots during my journey, so listen to me." They will be performing their music, and/or they will be teaching. Most people will never hear that part of their story. To answer: what can you do with such a person? LEARN what they have to teach. In other words, if they had to examine the stuff of music, they may have a much fuller picture. Their awareness may be more accessible, which may also help them teach a variety of students. The individual I am thinking of each have degrees in music, and are musicians as well as teachers. They know what others know, but because of that element in their journey, there are additional insights.
What I am saying is that there are elements in people's backgrounds that we never think of or know of, which may in fact be important factors in their musical abilities.
I think you misunderstood what I was saying. You are seeing some person who has not studied music formally at all ever, or dropped out early. I am talking about musicians with formal training, often with degrees, successful performers or teachers or both, but who had significant bumps in part of their journey.
What persuades us ultimately is how the person plays, what is in his or her music, and when they teach, that their teaching has substance. Some of that substance, insight, and clarity may come from the very fact that they had to work through nonsense at some point. When the sailing is smooth, you don't have to think about things, and you can take a lot for granted. Even if you yourself perform well, can you transmit that knowledge to as many students?