Honestly? I don't think most of the people who shit on Nagy completely understand what the hell they are talking about - like bitching that a mechanic didn't fix a car that won't go, when the issue is that the car is out of gas.
Here's what I know about Matt Nagy during the Mitch Trubisky era -
For the first 2 years, he stuck to his scheme and would not give up play calling duties. This is the end of what people who HAVEN'T been paying attention, including some major sports media people, of what they know about Matt Nagy because they never looked at it more closely.
However, I did.
The reason Matt was likely hesitant to give up play calling duties, is that his system is designed to scheme WRs open, and when you look at the tape - WRs WERE GETTING OPEN.... LIKE ALL THE DAMN TIME.
So, the scheme itself actually was WORKING. BUT!!!
There were 2 elements that were causing it to fail.
One - The offensive line consistently couldn't figure out who to block. They were often blocking the wrong guy. Lazy thinking is "DUR, THE OFFENSIVE LINE SUCKS!" But the thing is, it is wholly on the CENTER to make calls at the line and let the rest of the line know their blocking assignment on a given play.
And Cody Whitehair sucked ASS at it. James Daniels, in his brief stint there, wasn't much better and was often too quiet for anyone on the line to even hear him.
So this didn't get solved until Sam Mustipher got a shot, and was making the right line calls. All of a sudden, the line started playing a LOT better. Because the issue was the line calls. And now you have everyone back at the positions they should be at coming into 2021 so this shouldn't be an issue going forward. Want to blame that on Nagy for not knowing? Sure, I'm here for you on that one. But that doesn't mean his system is broken - this is a talent evaluation issue.
Two - Remember when I said receivers were getting open all day? Even when the offensive line COULD sustain a block with Whitehair at center, guess who was completely NOT SEEING the open recievers?
Good ole Mitch.
They spent 2 and a half years trying to get Mitch to actually go through his progressions and accurately SEE the open receivers...and the kid was a dumb as a box of rocks and couldn't do it. THAT was why they finally gave up and gave the kid a system he could run in the end of last season - but as anyone saw once they played better defenses, that simple system was NOT going to do anything but bum-slay in the NFL.
So the issue here was Nagy did indeed get stuck with a quarterback who was too stupid to make a read. That will make ANYONE look bad.
So now that the O-Line is stabilized and if Fields (or in the interim, Dalton) CAN make at least half those reads Mitch did not?
Suddenly the offense is going to look a LOT better, and Nagy by comparison.
And given the scuttlebutt is Fields was a Nagy pick, we are ALL about to find out what Nagy really can do - no more excuses now.