If you don’t take the courses a college does offer that teach “employable skills” then you can hardly fault them for not providing you with those skills. I don’t think colleges are going to teach the nuances between different careers or the “basic truths” about how companies work. You can certainly learn some of things at college by using their resources, but some wisdom comes from experience. I learned a lot about how companies work while I was in college by purposely searching out different types of jobs. Organizational behavior courses were helpful in gaining a basic understanding, but they couldn’t match the insight provided by a first hand experience.
People who advocate going to college aren’t lacking in imagination or an understanding of what it takes to be successful in today’s marketplace. College isn’t for everyone, but everyone considering college should have a realistic idea of what a college education can provide. I wouldn’t regret the years you spent at college. It sounds like you learned a lot and you’re still learning. Those are both good things.