So unless we want to downgrade Eli Manning to "decent" QB (which I totally support) then what decent QB's are we talking about?
Flacco? Like I said, he went on a record setting run to win his lone SB and has looked team hurtingly not good since then. Kaep? His two playoff runs were more than average and involved him making numerous game altering plays.
Alex Smith or a player like him is who I feel everyone has in their heads when they say "decent" or "average" QB. But look at KC recently. Take the playoff game against the Steelers last season. If Smith could've completed a TD pass to a WR since sometime other than his second year in college, the Chiefs might have beaten the Steelers.
Look at the past 3-5 Bengals rosters. What has their weak link been? Before this season (since they decided that o line was not important), CB and QB. On an offense featuring a top 5 WR, a top 5 TE, a above average RB, and prior to this year good to pretty darn good o lines. Those teams scared no one come playoff time because Dalton can't beat you enough times to matter.
Look at the last several Texans squads. Great WR. Good TEs. Decent RBs. Lights out defense. I mean they took the Pats to the wall. Except their QB play wasn't good enough. How much better than Osweiler would it have had to been? I don't know but that team might've been a SB champion except for poor QB play. Same with Denver. If Seiman coul've been an actual playmaker, then that team might've won another championship.
I can see the attraction of your point, but I just do not see recent real-world examples of this "everything but the QB is above average" winning formula. I do see it working if you want to be basically one and done every season with maybe a "lucky" deep playoff run every third year or so. And that is best case. Worst case is you pick about 15th every damn year in the draft and tread water year in and year out. Kinda the Jeff Fisher level.
That's not for me. It all starts and ends with the QB. If you don't have one, I really don't care what else you got on your roster, overwhelming probability is that you are not winning a championship.