Sure, self-awareness is good, usually. He might've been a lot more successful if he had stopped a time or two and really considered things like his strengths and his weaknesses, and figured out that it was good to get people that were good at his weaknesses, and that sort of thing.
But the tongue-in-cheek point is that I'm really beginning to get that all that consideration is just consideration. You still have to do stuff, and the people that I think of as the greatest examples of getting lots of stuff done don't seem to spend too much time dwelling on what they can do different, or on whether it's healthy, or on whether people appreciate it or not.
I can't imagine him wondering anything about his achievements -- even though he probably did occasionally -- because he always seemed to not have the time to wonder about it. He was busy doing stuff instead.