We all know confidently incorrect people. People displaying dunning-kruger. The majority of those people have low education and without someone giving them objectively true feedback on their opinions through their developmental years, they start to believe everything they think is true even without evidence.
Memorizing facts, dates, and formulas aren’t what necessarily makes someone intelligent. It’s the ability to second guess yourself and have an appropriate amount of confidence relative to your knowledge that is a sign of intelligence.
I could be wrong though.
Memorizing data doesn’t make one smarter… but learning concepts absolutely does.
The classic, “we’ll never need this in adult life” is math like Pythagoras’ theorem, or factoring binomial equations (remember FOIL?). We don’t learn that math because it’s practical for adult life… we learn that math so that grown ass adults don’t think someone using algebra is performing black magic.
Seems silly… but it’s just like how many folks never learned past middle school biology and now think XX&XY are the only chromosomal possibilities.