For the purposes of this discussion, we can ignore that the Colts had 5 D/ST TDs and 3 safeties that season (so their offensive PPG was not 28). The ultimate goal of the Bills defense should have been to get the Bills offense the ball as much as possible, not to let Indy dictate the game. The Bills' strength was their offense - the same offense that set a franchise record for points in a season. I'm sure that Reich was thrilled that his offense was able to keep the Bills offense off of the field for over 34:00. If you're happy with a defensive performance with zero sacks, zero turnovers forced, nearly 65% 3rd down conversion percentage, and 34:00+ TOP allowed, then great. Personally, I want the best unit of the team on the field as much as possible.
Yes, If the Bills had covered Kelce on that 3rd and 10, or Hill a couple of plays later (what happened to that old "bend but don't break"?), then (assuming KC didn't convert on the ensuing 4th down, or later on that drive) they would have held KC to 26 points. Unfortunately, games aren't 58:00 minutes long, and although I've never been a professional coach, my amateur opinion is that the opponent's two best receivers should probably be covered. Of course, the very next week, the unheralded Cincinnati defense held the same KC offense to 24 points, on the road, in over 60:00 of play.
Anyhow, given your impassioned defense of Frazier's defenses with the Bills, I'm sure that he'll have GMs knocking down his door next offseason with DC offers. Right?