[rossnordby]

I'd charitably interpret this as something like, "I did not learn anything useful or interesting in school that I did not learn elsewhere first or more effectively".

I'd endorse that claim, for the most part. I definitely learned all kinds of things that are not useful nor interesting, and then promptly discarded them. Maybe 2 or 3 isolated things in university passed the above criteria for me, and those were only possible because of the greater freedom offered in universities over K-12.

The times where I actually learned things, including abstract metalearning, were always when I was trying to do difficult things independently from school. School was just taking time away from that. It's important to keep in mind that the alternative to the current education system isn't 'child sits in a box devoid of all sensory input'- there are tons of possibilities.