I follow your logic, but I really think it's about money since they also put up barriers for testing out of classes.
Usually, a strong state-run community college program lets an Associates degree earned at a community college transfer into any public state university as a Junior. Most non-degree focused classes directly transfer. Going between states (staying in the same regional accreditation) seems to be difficult and not all states are set up like I had described. The theory being that someone who isn't quite ready for university has an opportunity to catch up and in my experience it gives more options when popular prerequisites are full. So the state has a reason to push for this.
I'm also skeptical about universities pointing to their qualification level because I've interviewed graduates from many well known universities and was kind of floored at the basic things many candidates seemed completely unfamiliar with.
Nationally accredited organizations don't have anyone pushing for this relationship. This seems to generally work for those schools because they can advertise as accredited, get a fig leaf of transferring credits, but usually want you to stay and complete tranning there. Most tend to be vocational which makes a lot of that moot.