Turgeon had quit doing his job long before he literally quit his job. He was nearly fired last year but the optics were bad. It's tough to fire a guy following a Covid season who was a year removed from a (three-way) conference co-title. This explains why the extension Turgeon signed had such favorable conditions for the school i.e. his buyout being reduced from $10M to $5M and new language that allowed the buyout to be paid out over several years instead of in a lump sum payment.
And to be clear, he quit his job. Turgeon initiated the conversation with the AD in a hallway under the arena right after that awful loss to Virginia Tech. To non-local media and fans of other schools this might seem suddenly and jarring, but this ending had been brewing and, despite the irregular timing, isn't all that sudden.
Turge had effectively stopped recruiting like someone who cares about job performance. He had literally handed off key in-game head coaching responsibilities to an assistant. He didn't want to do media. He didn't want to deal with boosters. He didn't want to deal with fans. He's the only college coach I know of who wanted to go unnoticed when he walked into a local store or restaurant. Turgeon shying away from big moments probably explains why he didn't win big games. He's a nice guy who seems much better suited for a 9-5 in a nondescript office park than the head coach of a Big Ten basketball program. He just wasn't a good fit at Maryland from day one. Nevermind his god awful boring style of basketball.
Sure, some Maryland fans are delusional. Lots of fan bases have delusions. The reality is Mark Turgeon is a really nice person but he's a mediocre coach who has made it to exactly two Sweet 16s in a 20+ year coaching career. He's a 20-10, first weekend of the tourney coach at heart. While I don't think he'll ever be a head coach again, I know he wouldn't be much better than that if he did. Maryland is no Kentucky or North Carolina, but with the money, facilities, conference affiliation, location in a hotbed of recruiting, fan support, and history/tradition Maryland has, it deserves a better effort than Turgeon was giving it.
Turge is worn down and has been for some time, stopped liking his job, and stopped doing much of his job. What fan base or AD would want that?