I'd say people have trouble understanding basic math because it's extremely simplified and minimized.
When you don't know a topic, the way to understand it is to see lots of examples from different angles related to things you know. The simplified formulas are good after you get that initial intuition and have to put them to work, but usually they're terrible at conveying how they should be used or why you should care at all. The history of how new fields of math are usually a much better approach to teaching it than a raw theorem-proof-corollary teaching style.
When you don't know a topic, the way to understand it is to see lots of examples from different angles related to things you know. The simplified formulas are good after you get that initial intuition and have to put them to work, but usually they're terrible at conveying how they should be used or why you should care at all. The history of how new fields of math are usually a much better approach to teaching it than a raw theorem-proof-corollary teaching style.