It's truly remarkable how different the mindset of the average, casual Bears fan is from folks who are a bit nuts (like me) who pay more obsessive attention to the Bears and the NFL at large. The casual Bears fan thinks Fields is great, promising, and is a no doubter to stick with. And the average Bears fan is irrationally gun-shy about moving on from someone that can at least appear to be a competent QB. There's almost a traumatic response to it.
But read what fans of other teams think of Fields - he's largely regarded as a mediocre QB. People are aware he can make spectacular plays, but there's....not really anyone clamoring for him. We shouldn't be satisfied with mediocrity, just because he's a nice guy who by all signs is beloved in the locker room and does everything right - outside of football. It's tragic in that regard. As a person, he's everything Jay Cutler is not. But it's also like, normal football stuff to move on from a guy when you get a chance like the Bears do.