Don't get me wrong, I despised the pick when it happened for that reason. He is a huge project and as such, was incredibly overdrafted. Trubisky shouldn't have been a 1st round pick. He is the most inexperienced QB to ever be taken top 10. The only one even as close to as inexperienced as Trubisky to be drafted that high was Akili Smith in 1999, and he had 20 games of college experience. We all know how that worked out. Mitch would have been a good pick at 45 where they picked Shaheen. He was an absolutely awful pick in the top 10, and I could at least defend it in the last 5 picks of the 1st round. Watson and Mahomes were higher on my board, though I didn't think much of either of them at the time, I thought they were both defensible 1st rounders, albeit outside the top 10.
Mitch is absolutely a 3+ year project and it was indefensible to pick him where they did, let alone give up the draft capital that they did. Blame Pace for the severe overdraft, don't blame Mitch for his inexperience. It isn't making excuses, it's just the reality of the situation. If you want to point fingers, point them at Pace. Trubisky probably shouldn't have been playing last year. This is Pace's problem, not Trubisky's. It isn't his fault he was severely overdrafted.
Trubisky is really talented, but the inexperience screws everything up. And there are questions about him not being able to beat a QB that didn't get a NFL camp invite for his first three years at UNC too. I don't have questions about his work ethic or talent, I have questions about his brain.
I also admit that the last paragraph is a longshot, but it isn't impossible.