Earlier quoted context omitted.
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…
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"
If someone is entering a prompt to generate an image in a model I have access to, I don't really need to pay them to do it, and definitely don't need to pay them as much to do it as I would an actual artist, so it is deceptive for them to represent themselves as someone who could actually draw or paint that. If the product is what counts then truth in advertising is required so the market can work.