A common justification for group projects was, "you have to learn how to work with people, even people who will not work." Yeah no, that's not the case. People get filtered through a much finer sieve when they're older.
But that's absolutely the case. You get on a project and someone falls ill or has to take care of someone ill. Or they're shit at their job. Or they're just not as dedicated as you. It doesn't matter if they get fired or accommodated, you have to get it done. You will be punished in some what for not getting it done, whether that is directly or indirectly. Group projects exist in any job with collaboration. You rarely get to choose your group unlike in school and at least proving someone is a slacker has a high chance of impact in school. It's not always the case at all at work.
People discount school rituals, but they happen a lot. Pop quizzes happen all the time within my career. You don't always get to say, "I'll get back to you" as much as we all wish that was true.
