Because they embody the worst traits of Bill (hubris, alienating certain players, treating them like chess pieces), without any of the positives (some really great gameplans, and actually having decent interpersonal skills), and without also having the best QB ever (who also had GOAT level leadership and intangibles) to cover it up any flaws and get the team to buy in.

And even then, Bill has started to look like his assistants without Tom as well.

I’m not saying Belichick is horrible coach or anything but it really shows you how important having the right QB is.