That's because most of these people don't understand how a team prepares to play a game of football. They believe that most programs would be interchangeable and that one team doesn't have any % difference over another and that talent of the players is what makes the biggest difference.
Thus, they don't understand why people think BB is the best coach during this time period or any time period. He has everything moving in harmony and really leaves nothing unanswered or unprepared. They still assume he's the same coach from Cleveland and he didn't learn along the way of what it takes to win in the salary-cap era.
Thus, if a team is winning so much with so little talent (except at QB) then they must be doing something wrong. It's actually the opposite, they are doing something more "right" and it has to do with coaching.