[staunton]

> Linear algebra is not hard

Keep in mind that this term covers a huge range of math that can be introduced at very different levels of abstraction and generality. You might think linear algebra is mainly matrix multiplication and Gaussian elimination, someone else might think it's about the representation functor in Abelian categories.

[com2kid]

We're talking about HS intro classes, so my use of Linear Algebra was at the same level as saying, well, Algebra. E.g. Non-math major uses of those terms.

Almost any subject in math can go really deep!

[staunton]

Yes. However, I read your post as suggesting (given the quote you respond to) that significant numbers of high school students can/should take university level courses of the same name as their high school courses, presumably because it's the same thing.