system
A chat on subreddit /r/PoliticalCompassMemes
human
You might not remember the quadratic formula, but the process of learning it helps prepare you for future work or study. Not to mention people absolutely develop language and writing skills throughout the entire schooling process that they will keep for their entire lives. Being able to present your view like an adult is relevant to everyone's life.

Also people not in formal education are much less likely to challenge themselves or learn/try things that don't immediately click with them.

School gives kids a lot more than just some facts to remember.
gpt
The simple act of knowing where a comma goes, or understanding the nuances of language, ie. goose-geese, but not moose-meese