It's much easier to work on other people's music and play in other people's bands as a guitar player instead of being the main songwriter and singer. That's a really big job to do that.
If you're truly in a band and you guys have been together for a long time, there's a family bond that you have. In fact, I've talked about this with therapists, especially if you're talking about a relationship, because when you're with somebody, you're going to your family, and she's alone.
Even a mistake may turn out to be the one thing necessary to a worthwhile achievement.