There's a lot to think about. eh? What are the takeaways? What do I know: not much! But here's what I think. Most of it is obvious; the rest is probably erroneous:
1) Mac is not as good as Josh Allen, and he's not likely ever to be. But he's good enough already to get into the playoffs - that's proven - so in the near term at least - a few years? - we do not "have a quarterback problem." Last year, when we had that stumblebum Cam launching random eephus shots all over the ball yard, we did, but we no longer do. Mac is good enough, which, if you can put a decent team around him is ... good enough.
2) The jury is emphatically out on Steve and Jarrod (et al) as NFL-level defensive coaches. I say the jury is out rather than 'they blow" because...
3) The defense is old and slow. Hightower is past it, and the LB's as a group are sub-par and slow as molasses. The secondary is sub par, particularly, taken as a group, the corners. There's more reason for hope with the safeties. We need one more YOUNG dynamic pass rusher who can be at least serviceable against the run. Judon kinda c--pp-d out at the end there. He is what he is, or was, and what he is is pretty good but clearly not all we thought it might be early on. Keep him, but get a plan B.
4) A few players are just hopeless. N'Keal is irreparably bad. Wynn is worth keeping but he will never be what we hoped. He lacks focus and discipline, and he can't hack any sort of adversity, healthwise or otherwise. I hoped for a while that Jonnu would get his head out of youknowwhere, but evidently it's superglued up in there. Agholor is hopeless, and way overpaid. Cut your losses and get rid of him. I don't even think he's trying, tbh.
4) This team does NOT have a #1 receiver, nor does it have anybody who shows any realistic prospect of becoming one. If we have a slot guy, I'm not sure who that might be. We have ONE decent tight end, and one only, The second one is not presently on the roster, and we need to go get him.
5) I think Josh is an excellent coordinator, but he has GOT to let Mac have the reins more going forward, and avoid getting seduced by his cautiousness into the run-run-pass trap.
6) The season was a success, given the improvement, but the rebuilding is far from done. I expect about the same sort of result next year. What this team is thereafter will be determined by the off season, by the team's success at replacing a significant number of players who are past it, or about to be, or just no d---d good.