It seems the issue the article is trying to highlight is that BB’s assistants are too micromanaged to learn how to be a good coach because BB lives and breathes football (Why Tom Brady thrived in the patriots?). BB may just be that good and can be the only person who’s had success with this style of coaching. Also why would he change if having a coaching tree is more something to worry about legacy wise than game to game or season to season? Just get the guys who you’ll know will do their job and win games.