Finding a spouse and, summarizing your description, learning how to deal with others as an adult are not things one needs to go to college to learn how to actually do.
Plenty of ways to do that while getting paid instead of forking over 5- or 6-figures. I would argue the true cost is even higher when you count lost work time and experience.
There is not much of an argument if all you have are vague points about learning maturity that naturally comes to anybody aged 18 to 25, especially if they are working.
You would have matured and figured out most of the same stuff at the same ages if you were not in school and working instead, and you probably would have been dating, too.