Before #credentialism:
You learn at school because otherwise you can't get results.
After credentialism:
School is for getting a paper that says you are better than others. You are paid not for your results, but because no one dares contradict the magic paper.https://twitter.com/Kxela/status/1039497837858508807 …
To be fair, the admissions process and grades/degrees from some places were good IQ filters/signals in the past.