Ben Johnson has leverage because he has turned away HC opportunities the past couple of years and has continued to excel in DETROIT (of all places) while turning JARED GOFF (of all QBs) into an upper-echelon performer after SEAN MCVAY (of all coaches) threw his hands in the air and traded Goff away.
Ben Johnson is going to be a 1st-year head coach and wants to take every precaution to ensure that he has the best chance to be successful. He likely has his pick of options, and if he doesn't, he's proven to be content running it back in Detroit until he does. I'd say it's classy of him to avoid wasting the time and resources of teams he isn't interested in, and I have zero issues with him taking what he feels is the best opportunity for success. It's not his fault we're consistently rated as the worst HC opening in the league, it's ours.