You are correct that in our world currently and maybe even in the past, the kids never truly learned math in school. I studied in the top university in my Indian province with 50 million people, and most of my undergrad colleagues truly didn’t understand what differentiation and integration actually meant.

But it doesn’t have to be that way. The kids are supposed to learn things in school, we just need to pull our heads out of our assess and acknowledge that almost all current learning systems suck and try to reset from the ground up.