The premise of this article is that Bruce "doubled-down" on his strength: song-writing. The life-lesson being that we should focus on our individual strengths instead of chasing someone else's strengths.

But I think Bruce just did his thing, and it happens to be that he was really-really good at it. I don't think he chose to focus on lyrics vs guitar skills or vocal skills. He just wrote songs and played guitar and sang --all to the best of his ability-- and it turned out that the sum of three was phenomenal.

The author is correct in his lesson. But Bruce is not an example of it. Instead, find a person who failed repeatedly while chasing something they were not great at, then found success after consciously switching gears and being more true to their own strengths.