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I think the OP is saying that the coach can only take you so far if you don't have an elite QB. Just look at Pitt, they can't get past the first round despite the greatness of Tomlin. I think we are starting to forget how great Drew in his prime was.
Last year Allen was being discussed as the most overrated QB in the league and is now looking at possible MVP. Granted the change was an OC and not HC, but a bad coach has bad dynamics that trickles down to the whole team like a tumor. Likewise if he has good dynamics it’s the same. Coaching is super important to elevate players and put them in position to succeed.