I think this is a really important point and to add on, there is a lot of writing that is really good, but only in a way that a niche audience can appreciate. Today's AI can basically compete with the low quality stuff that makes up most of social media, it can't really compete with higher quality stuff targeted to a general audience, and it's still nowhere close to some more niche classics.
An interesting thought experiment is whether it's possible that AI tools could write a novel that's better than War and Peace. A quick google shows a lot of (poorly written) articles about how "AI is just a machine, so it can never be creative," which strikes me as a weak argument way too focused on a physical detail instead of the result. War and Peace and/or other great novels are certainly in the training set of some or all models, and there is some real consensus about which ones are great, not just random subjective opinions.
I kind of think... there is still something fundamental that would get in the way, but that it is still totally achievable to overcome that some day? I don't think it's impossible for an AI to be creative in a humanlike way, they don't seem optimized for it because they are completely optimized for the sort of analytical mode of reading and writing, not the creative/immersive one.