I'll never get how teams hire a position coach instead someone who was the offensive/defensive coordinator
Have you ever had to hire and fire people? Because you sound like someone who's never had to do that. It's not a science,. It's an art. Hiring the wrong person can ruin a team/culture and it can take until long after they're gone to get past the effects.
Also, position coaches who are considered "up and coming" are the hot commodity now because of Sean McVay. Have you seen the Chargers new coach? I swear when I saw him on tv this morning I thought they were doing an interview with a high school kid who had done something newsworthy. Then I realized they were interviewing the Chargers new coach. lol