Ok a difficult teacher being like difficult boss I would agree with.Oh, I agree with that. When I said it would help her navigate a difficult boss later, I didn't necessarily mean that the boss would assign group projects like this. I just meant that there would be things the boss assigned that seemed unreasonable and eventually you have to find a way to deal with it.
I always was told it would help navigate difficult coworkers. However I do not have any coworkers that are even half as bad as some of the fellow students I would have to work with because they tend to not last every long...
However if I hated my boss and found her very difficult I could put in for a transfer to another department, find another job, etc. Students don't have the ability to do that in school (they may a bit IF a parent agrees but really not shot otherwise).
Honestly I find most of the people that say things at school were life lessons to be bull. When my MIL died if I had been in class and not in the middle of an internship I would have failed all my classes due to missing 2 weeks of class to be with DH (espeically since he was a month shy of being DH at the time) however if someone has an emergency like that at work and the response is "Go take the time you need, let us know what is going on when you can and if you need anything." not to fire you like school would tell you should happen.
School tries to teach you to always turn things in on time and its better to have them be bad then late... yeah if you did that in many industries people would die.