He's just not special, or extraordinary, like Watson or Mahomes. He had no real first off season, expected to ride the bench behind Glennon. Then he was put to task as a starter under Dowell Loggains/John Fox. He and Nagy had one so-so season their first year, and now teams are aware of their tendencies, and weaknesses, causing them to struggle. Expected, IMO. I also expect it to take a bit of time for them to find their counter, and hit a stride of some sort. Mitch is still learning, and so is Nagy. I understood this when Nagy was hired.
The play of other teammates this year has not helped. And the boost to the defense by Mack has ramped up the timeframe for many fans. I always felt the end of this season is when to really start thinking seriously about Mitch's future as a Bear.
To be honest, I knew the O would struggle early this year, and even felt there could be a chance of Mitch tanking. He hasn't yet ... so there's that, lol.