We have to draw the line somewhere with art, of course, and that usually comes down to a combination of what consumers value, and broader perceived cultural merit. Nobody really cares about the well-being of artists who specialize in making pretty paper airplanes, or drawing pictures using only the MSPaint pencil brush.
I think the audience, not the tools, deserve the most scrutiny here. Look around at this very thread, and all the people defending what the LLM wrote. Their feelings can't be argued with. But they make me feel sad and alienated, because I see a vast difference, so vast and so obvious, and they see none at all.
In the future, perhaps people will enjoy LLM work -- genuinely enjoy it -- as much as I've enjoyed Vonnegut or more. It may be the inevitable result of a broader cultural shift away from reading and writing. I guess with time, maybe we'll find out how valuable it actually is to have a strong command of one's language... I imagine, at least, people today are much better at other things to compensate.