It would be nice to have pro-bowl QB play...
I don't blame Nagy for not having a great QB.
However....
I blame Nagy for not playing to Trubisky's strengths like Lazor was able to.
I blame Nagy for calling tentative offensive plays at the wrong time
I blame Nagy for his players being unprepared at times
I blame Nagy for the worst player personnel calls on the field at the absolute worst times
I blame Nagy for going to well too many times on particular plays and not being a step ahead of the defense 90% of the time
I blame Nagy for being stubborn and not responsive enough in his playcalling in its entirety
So, this hits some good points, but I will refute a little of it. The thing that sucked about Trubisky was his strengths weren't really consistent. He was super mobile but refused to run at times. He was the perfect RPO QB, but often made the wrong reads (see Nall 4th and in playoffs). He would execute a play to perfection then get the same look defensively and blow the read. I honestly don't blame Nagy for not playing to Trubisky's strengths because he was all over the place as a QB. I honestly think he tried. At the beginning of last season, there was a lot more under center. A lot of half field reads. The playbook was cut to plays he thought Mitch showed enough in practice to run on gamedays. But as I said, Trubisky wasn't even consistent in his strengths as a QB. So, I also think that's why he went to certain plays. A) to get it out of Mitch's hands or B) to call a play he thought Mitch would be comfortable executing.
And that's not to absolve Nagy of blame, those other points are all 100% failures of his. I honestly think Nagy should have stayed aggressive with the playcalling to make Mitch sink or swim. I understand not wanting to lose games, but they were losing them anyway. If I were him, I'd rather just create a situation where nobody can question the playcalling if my QB threw 3-4 INTs or missed a bunch of throws. Granted, I know Nagy would potentially be fired if he lost a couple more games, but I feel he actually protected Mitch from criticism, therefore taking it on himself on several occasions. That being said, excuses are done. He got his QB (can argue he did with Foles too) and the offense the way he wants it personnel wise.