I think you are just seeing that it's very hard year to year to be consistently great in the NFL.
The odds are stacked against you in every way possible.
What the Bills have done is not common, and while some struggles can be seen as a step back, it's really not much different than in 2023 or even 2021 at this point of the season.
In 2023 we were 6-6.
Nothing matters until the playoffs really. I mean sure the 1 seed would have been nice but that's likely not happening now.