People are throwing around all kinds of different numbers in this thread, and some of them seem to have questionable accuracy and/or small sample sizes.
I pulled some data myself to see how the # of passing yards relates to (1) your chance of winning the game, and (2) the # of points you score per game.
I wanted to make sure I had a big enough sample size, so I used 2370 games from 2015-2019 (all games excluding ties). All data came from https://www.pro-football-reference.com/. Here's the output data in table format - https://i.postimg.cc/529576Wt/pts-data-2.png.
For games where they had <200 passing yards, teams won 44% of their games & scored an avg. of 17.7 pts per game. For 200-299 passing yards, teams won 52% of their games & scored an avg. of 23.3 pts per game. For 300+ passing yards, teams won 55% of their games & scored an avg. of 29.0 pts per game.
To me, it looks like passing yards have a strong relationship with winning, and a very strong relationship with the # of points you score. If you're passing for less than 300 yards in a game, your chances of winning are only ~50% on average. That's not to say it's impossible to build a team that has low passing yards and wins a lot, but it probably requires you to have an amazing defense and running game (this year's 49ers are a nice example - averaging only 219 pass yds/game but scoring a whopping 29 pts/game).
So far this season, the Bills are averaging 215 pass yds/game and scoring 19 pts/game. The stats above suggest that it's tough to win many games with those kinds of numbers.
