I have read almost every kind of fiction under the sun. My standard for what is great is pretty high. This is why I am perfectly willing to accept LLM output as lot as the writer has put in sufficient work into the same. Because this kind of writing can produce middling to good enough fiction, like most genre fiction. Which I enjoy for the plot, characters and environment.

If a great writer used LLMs, then the output would be outstanding. Of that I have no doubt.