Right, but the other 99.9% of people don’t go to a “good” college. Plenty of ones that are considered quite good by the Little Folk—the mere commoners—can be attended with grades far from a 4.0 and nothing special in the extracurriculars department, if your test scores are decent (and I assure you, the cutoff for lots of them is way under what you’d consider good)

Your university does not define you. Plenty of people go to a crap university, yet can still be the top of their field one day.

It's easy to say that now, we being adults long out of high school. Do you really expect a high schooler to understand that? I sure as hell didn't back then (my guidance counselor strongarmed me into a curriculum specifically around meeting UC and CSU requirements, despite me having nowhere near the GPA to get into any such school), and thus admission into a 4-year university was an extrinsic motivator that seemed unrealistic and was therefore ineffective.

Well, I only left high school last year... I don't think it's impossible to at least guess this. I think I got very lucky in realising that the school's goals (push me to university) were not aligned with my own.