The Bills were the only NFL team to be top 5 in offense, defense and special teams. Obviously they laid an egg yesterday and everyone and their grandma pointed out they missed Von Miller. But that doesn't mean they are the vastly inferior team. If the Bills and Bengals played each other 10 times (imagine each game as independent, in a vacuum), I wouldn't be surprised at all if it ended up 5-5 or 6-4. With so much parity in the NFL, free agency and salary cap management, there's no guarantee the Bills will again be a top contender next season.
But you're being results oriented if you make the claim that the Bills have a lot of problems on offense and defense. They had a bad game against a very good, confident team. They are NOT the 2021 Packers or 2022 Vikings who were clearly overrated.
You have valid points, but it definitely did not apply yesterday. For one, there is no QB in the league that can throw a ball 80 yards in the air to the end zone. Because of Dalton Schultz's ineptitude, the Cowboys were forced to resort to some form of laterals "play" to go 75 yards. Finally the only blocker was "center" Zeke Elliot, so I'm not sure why you would ever rush 5+ defenders against one.
The Hail Mary itself is quite low probability (backed up by decades of evidence). Maybe it's better than some trick play with laterals, but we don't really know because I've never seen evidence the latter is practiced much in the NFL. There are occasional trick plays such as The Philly Special or fake punts, but those are mostly short yardage situations as opposed to 50 yard prayers. Like I conceded before, it's possible trickeration doesn't work well in the pros, so few teams bother trying.