There is so much more to college than learning vocational skills and a certification. Those skills are only a tiny part of it and self-development, especially of your intellect and knowledge, is most of it.
I don't think that anyone would suggest that someone motivated could get by with building their own dreams without subjecting themselves to academic torture.
If you start with that premise, there's nothing left to discuss. But many find college worthwhile and the best years of their lives, personally and intellectually.
If you want to go and work for someone else, you need a college education.