Now if you're talking about Aaron Rodgers to the Raiders then that's a whole different dynamic. You're talking about a transcendent QB who can take a terrible defense, mediocrely coached team to 13-3 and perennial contention as long as he's healthy.
Watson on the other hand? Good slate of receivers, good offense... terrible defense, bad coaching staff, 4-12. Not a transcendent QB. Watson and Carr are both solid QBs but winning with them requires a good overall team, you can't just have a trashy defense and OL and/or coaching staff and expect to win double digits and make the playoffs every year like a Brady/Mahomes/Rodgers.