I have a couple of issues with Harbaugh. One issue is that despite all that stated success with the 49ers...they basically forced him out due to the disfunction that he brings.
The other issue comes in when you look at the actual stats of those teams and how they actually played and won.
They had some dominant defenses with Fangio. They were stacked on defense. That 3 year run (2011, 2012, 2013) consisted of these rankings for the defense: 2, 2, 3.
And they needed to that stacked defense because the offense wasn't actually that good. Same 3 year run for offense. Overall offense was 11, 11, and 11. Break it down further, Rushing Offense was: 8, 4, 3. Passing Offense was: 29, 23, and 30.
We have seen this crap before: Strong Defense, Strong Running game, and a Crap Passing game. Why do people still want this in 2022? The rules have changed so much to favor offense and passing, the Bears have the most talented QB they have ever had...and people want to put that into the hands of a guy that was only successful with a dominant defense (coached by Fangio) and the running game. The reason he won with Smith and Kaepernick was that he didn't ask them to do as much as you do in a modern offense.
The current Bears team is not set-up to make a 3 year run of dominant defense. Maybe 3 years ago they were close and again with Fangio but that ship sailed. They don't have the dominant offensive line to do the ball control, running game.
IMO, this roster and the modern NFL is not a good setup to have Jim Harbaugh go to Chicago and be successful.