I would give Fields the benefit of the doubt in that (1) when he was in Chicago he did not have competent coaching and now (2) he went to the woebegone Jets who are a dumpster fire of a team. He may still prove to be a capable NFL QB given the right setting (e.g. Sam Darnold, Baker Mayfield…).
As for the Bears I do remember a certain Jim McMahon back in the day and even Rex Chapman at QB managed to take them to a Super Bowl. So they haven’t been as bad as … Cleveland say.
Sorry… Rex Grossman.