Linear algebra is a relatively straight forward subject. I won't say easy because there are bits that aren't, and I struggled with it when I was first exposed to it in college. But in graduate school revisited it and didn't have a problem.

So, I really agree that it's about timing and curriculum. For one, it appears somewhat abstract until you really understand geometrically what's happening.

So, I surmise that most non-mathematicians don't have quite the mathematical maturity to absorb the standard pedagogy when they first approach the subject.

Why isn't the "standard pedagogy" always evolving and improving? Isnt that what pedagogy is?