> maybe we whould require children to work before getting to uni if they don't know what they wat to do yet

You can easily get lots of information about various jobs using some magic technology called the "world wide web", so there is basically no need to work before university to get an informed opinion. If you are incapable of doing this, you likely simply don't "belong" into a university.

Looking back at my life, the problem is rather that the only kind of internships from which you really "profit" because they extend your perspective, are basically "unreachable" if you don't have parents or friends who are insanely well-connected in upper circles.

Also, if you worked in some "practical" area before going to a university, you will in my opinion become a much more misanthropic and arrogant person because you have seen how "stupid" the people were at that job. The university bubble helps you to avoid a lot of contact to "ordinary" people, and instead puts you into an environment where most people around you are much smarter, and you have to "fight hard for survival" (passing a class; passing a class with a decent mark; ...). Because this experience is very humbling (intendedly so), this makes you a much a much more humble person in your defining years.

There’s a vast gulf between “reading about a job online” and “doing a job”. Of course college bound kids know that jobs exist, but they don’t know what it’s like to do them for any extended amount of time. And I’m guessing that one of the main reasons that they don’t know what it’s like is that their parents and every other adult guiding them has been telling them, implicitly or explicitly, “you’re a college bound kid, jobs like this are beneath you. Just focus on school”