I agree, no one should be forced to sit there for anything, but in a multiplayer game one person dipping out the second they're not winning or get interacted with effects more than just themselves, and I think it is completely reasonable to have some form of punishment for consistent bad behavior.
As for creating new problems it definitely could, but it wouldn't surprise me if the server had the information on if you were just waiting two minutes before passing each instance of priority you receive to wait out any clock requirements.
I would just like some tool beyond blocking people who salt scoop to control the quality of games you get with open lobbies of commander.
Even in multiplayer though, its just not fair to force people to stay when they don't want to. That feels very "sore winner". Why should someone be punished because they're no longer interested in playing a game?
I'm certainly not the type of person to deliberately wait out the clock. But if I was absolutely forced to continue playing when I didn't want to, I'd just yield my turn every turn without doing anything until I was taken out. It just feels like it would create way more problems than it would solve. I wouldn't want to join multiplayer games anymore out of fear that I'd be stuck having to watch 3 other people play until they were all satisfied and felt I could leave. It's just not reasonable.
I understand that early scoops upset people, but so does losing, being teamed up on, having your commander killed for the 3rd time and knowing you'll never cast it again. It just seems completely unreasonable that players should be punished and have to choose between watching 3 other people play OR be banned.
I don't really think players scooping early is the same as childish players intentionally keeping the game open and letting the time run out or even worse...ive seen players that will go so far as to like tap a land every few minutes to keep themselves from timing out and just run the clock to zero.
IRL there IS rules against slow play, because it makes sense to have those rules. It wouldn't make sense to force players to have to stay in a game X amount of time before they can leave, lest they not be allowed to play anymore in the future.