I mostly agree with your sentiment, but saying "math is not art" is the same as saying "writing is not art". Calculation isn't art. But math isn't calculation. Math is a social activity shared between humans. Like writing, much of it is purely utilitarian. But there's always an aesthetic component, and some works explore that without regard to utility. It's a funny kind of art, accessible to few and beautiful to even fewer. But there is an art there.

This really made me think and you're right. Perhaps I should have said "calculation" instead of "math."

When it comes to art, description is after practice

It does not matter if they are labeled "composer" or "director ". It is the product that counts.

"....I know what I like"