What actually seems to happen is: "Spend at least 3 years making your way through CC, then somehow still take another 4 years to finish at the University."
Students who can actually manage to complete the 2+2 may be better off just doing the 4 at the University. (And might actually do it in less, due to AP credits and other things.)
Any source on this? Because going to CC and then moving on to University in 4 years total is exactly what my sister, and grad school advisor did. His path was particularly good, going CC -> State University -> Ivy League PhD.
I've personally known people to pull off the 2+2 as well, but I've also personally known people who basically had the University look at their two years at CC, pat them on the head, and told them they get basically no credits because they didn't accept the level of courses involved.
The crazy costs of university have made us look at university through the lens of job training, but there's a lot more to university than that. It just not worth it when you're going to be $100k in debt.
It seems like as the situation has become more universal and more central to the national conversation, the pendulum has again flipped, and I rarely see people mention the benefits of university beyond job training.