I don't mean to be mean but.
If you think the Bills were lucky...then you do not watch enough football...if you do watch a lot of football you are not understanding it enough.
Look around the league. Pittsburgh killed the bengals, Atlanta beat the colts, The titans have played seattle down to the wire, The panthers are tied in the 4th with GB. I suspect New England is going to play a really tough game against Denver tonight and same with the giants vs the eagles tomorrow.
The Bills defense had 6 sacks, all at critical times and forced the chargers to kick field goals. Allen was 15/21 and accounted for 3 td's. The running game did exactly what it had to do to allow that final drive to keep the clock moving and kick the field goal to take the lead.
Were they lucky? I dont know maybe...however it looked like most nfl games look in 2023. There are no great teams in the league this year. Its a week to week league and everything is about matchups and location.
Almost everything you posted comes from your critical misunderstanding of the game and league you are watching.