I wouldn’t say that is underrated. Not here, anyway.Just read this article today:
https://www.businessinsider.com/tom-brady-contract-discounts-patriots-bargain-2018-7?utm_source=reddit.com
Brady has sacrificed some $60 million in pay from the Patriots over the course of his career. He can do it comfortably because Giselle makes a billion dollars a year and it's not like Brady is getting paid peanuts. But in a league where everyone is trying to make max money, Brady giving up $$ has helped build a better team. A totally underrated aspect of his greatness.