Well I agree with that, but Girardi was a great manager. He had enough of a presence of mind to accept analytics and go by the book when necessary, but go by his gut when the numbers didn't always give you the best answer.
He was also a great disciplinarian. Look at Sanchez. The guy has been a loaf with a terrible attitude his entire career. Girardi straightens him out and he has an amazing first two seasons. They get rid of Girardi because he didn't want to coddle Sanchez (and rightfully so) and the guy totally slacks off falling into his norm of indifference and his numbers suffer mightily.
If I'm Yankee management, I suck up my pride and go beg Girardi to come back and offer him a ridiculous deal.