I wonder

I have recently started a new book called The Season Of Life. It is about a football coach, and his history. There are a lot of things I wonder about this book, but the biggest thing is this question, Is there a point when a coach can be too loving and caring, that his players begin to lose their focus on the game. I think there needs to be a balance. Some coaches say "I'm not your friend, If you were looking for a friend you are in the wrong place"(Hoosiers) and some coaches like in this book love and care for their players like their own children. I am wondering what the best ratio between these two mindsets is, and how much of a difference they will make.