IMO, everyone should know the basics of a wide range of things from cooking to statistics. It’s just a question of diminishing returns. Failing to understand the basics of say investing is really costly even if all they do is dump 90% of their money into a low cost S&P 500 fund and forget about it that’s vastly better than what most people do.
The same applies to school, teach your kids the basics of reading and math let’s them coast for years.