There's a pretty significant gap between Trubisky and the third best QB in the NFCN (Cousins). This kid is talented but he kind of sucks. I don't know why, but he sucks. He was a reach when he was drafted and it's showing.
Matt Nagy did not help Trubisky at all though through playcalling and personnel
The Packers defensively were playing for the pass -- either lining up in 3-3-5 Nickel, 2-3-6 Dime, or 1-4-6 Dime throughout the game. While DT Kenny Clark played almost the whole game, DE Dean Lowry only played 47/73 snaps... and the next most used DL was DE Montravius Adams with 22 snaps played. Compare that to S Raven Greene, who played 56 snaps (mostly functioning as the 2nd ILB next to Martinez), and CB Kevin King with 42 snaps as the third corner (Tramon moved inside to the slot), with Tramon, Amos, Alexander, and Savage playing every snap.
Essentially, they played very light fronts and forced the Bears to run the ball against them. But the Bears still didn't do that. Despite primarily running in '11' personnel (they're using Tarik Cohen as an H-slot receiver this year, rather than as a RB and it honestly isnt a bad decision), which already means you have an advantage to run the ball, they gave an RB carry only 12 times from those 73 snaps. 6 to Montgomery, 5 to Davis, and 1 terrible iso call to Cordarrelle Patterson. And only 3 of those carries occurred in the second half, with the last one happening with 10:31 left in the 3rd quarter. That's embarrassing.
When the defense is running mostly dime defense, and you have Trubisky pass 45 times (plus 3 QB scrambles and 5 sacks, so closer to 53 pass looks), its just bad playcalling. I get that TE Trey Burton was inactive, but he shouldnt be the vital piece of the run game. Mike Davis played WAY too much (wisely used for pass protection) and they should have just fed Montgomery the ball more, especially out of a look under center rather than in shotgun (his six carries were all out of shotgun).
If you have a moderately competent ground game, the rush comes slower and its easier for your reads. And when the defense is TELLING YOU to run the ball, and you still don't....
This game's on Nagy. Like Trubisky sucks, but there were moments that he looked sharp -- mostly via playaction and RPOs, aka pass concepts that use the threat of the ground game. But once it became obvious they were throwing the ball every play, there's only so much he could have done