Where did you see "defenders...saying they're reading our plays"? That's been a growing complaint of mine on BOTH sides of the ball, tbh. The players are at a disadvantage far too often because the play callers rely on poorly disguised tendencies/concepts. The Bills seem easy to scout, overall. Also, the (offensive) players seem to do a shite job of executing wrinkles and creative calls, which potentially speaks to how little practice time is spent on diverse concepts each week. Their comfort zone is incredibly narrow, apparently.
It's truly unfortunate that Allen will spend the absolute prime of his career with substandard NFL offensive play design and play-calling. Really robs us of so much joy when watching the Bills. There is a GULF between offenses like the Bills and those of McVay, Shanahan, whoever the eff is calling Tampa's plays this season, etc.
All this ignores or sidesteps how easily opposing offenses can motion our defense into predictable and vanilla concepts most of the time. Again, putting the players at least at a disadvantage.