It's not just QBs either. It's entire teams. One-team fans tend to be very myopic, myself included. We watch our team struggle against a team they really "should" beat soundly and we get frustrated and think we won't be able to compete against the really "good" teams, but if we just look around we see the same thing happening everywhere.
Just one example among several this week: Kansas City trounced the 49ers and look like the best team in the NFL, but just a couple weeks ago they lost to the Colts, who looked like the most inept team in the NFL yesterday against the Titans. And if you think the 49ers are done now? Think again.
I think it's just that in the NFL in 2022, every team has talent on their roster. Winning and losing mostly comes down to being healthy and the game plan you draw up for your opponent, and theirs for you. And that will always be a shifting, moving target.