I haven't gone back to watch any New England "film," but I did see their offense look pedestrian against the Falcons. And aside from gaudy completion percentages, it seems like Mac Jones has mostly been just an efficient game manager, thriving on the QB-friendly, underneath stuff like swings and crossers and slants. (Which, if memory serves, IS how New England's last good QB started his career, just sayin.)
It's a testament to their coaching (effing gag me) and to Jones's coachability, no doubt.
It's also exactly the kind of offensive attack the Bills defense struggles with: run-heavy with well-timed play-action and easy small-ball passes.