Its not like there aren't a few D2, FCS, and G5 QBs that move up to P5 FBS football and ball out as starters, nevermind the ones that become backups. There are Cam Wards every year. Sometimes multiple. There are also tons of former 4 and 5 star studs looking to make a move...it doesn't have to be the obvious ones like Caleb Williams or Quinn Ewers, but Bo Nix, Jayden Daniels...two...disappointing players (not busts, just didn't play their best football) that transfer and find big success.
The only way my brain can wrap around multi-million dollar coaches taking these guys at this level, is, perhaps, you set aside one scholarship a year for these kind of QBs you just take as a lotto ticket. Maybe they have a trait or two that you love (size or smarts or good leadership quality). Thats your one scholarship play money allowance, idk. Maybe some teams factor this into their roster construction...if they get on campus and they are a dud, they transfer and you just replace him with the next lotto ticket? idk. Sooner or later you scratch it off and you win your money back with a guy that will stay until they graduate and they were a good teammate through..or win big enough to make this endeavor worthwhile, perhaps, and you find a starting quality player. idk Plus, you need camp/practice arms, too. These could all be factors in team construction philosophy some teams have.
Matocha was here, got his degree, showed up to practice and threw the ball when needed and I believe transferred out...either way, maybe there is a designated slot on the roster for that guy on every/most rosters. I wouldn't have a problem if that were the case. Someone has to help relay plays, understand the offense, help with general roster construction etc. That can't be a guy that doesn't stay for a few years, so, I get it from that perspective, I guess.