I think the problem is that most students think a PhD is just like studying a bit more, but that's not what it's meant to be. It's largely a multi-year solo pro

I think the problem is that most students think a PhD is just like studying a bit more, but that's not what it's meant to be. It's largely a multi-year solo project with some support, and it should set you up to become an independent researcher. Part of the problem is that most "university" studies, especially US colleges, are too similar to high school with rigid schedules and teachers closely leading classes throughout the semester. Other models where students are more responsible for organizing and completing their studies foster building independence at an earlier stage already.