I've used AI to create stories for myself, to see this exact thing. The most notable thing about an AI-generated story is how contrived and cliche they are.
Now is that a problem? In the right context, no. It's fantastically awesome in minimizing my workload as a DM for my DnD game, because every DnD story is contrived and full of cliche's, that's what makes it fun.
But for books or real stories? Not really. Let's use some fantasy and sci-fi as an example, and a lot of what I'm about to say is cribbed from Brandon Sanderson's lectures on the development of the fantasy genre. While there were epic sagas before Tolkien, The Lord of the Rings really started a movement in this genre. Others came up with their own takes like Moorcock or Zelzaney, but Tolkien really spurred a movement. Then there was a second generation of fantasy novels, which followed the Tolkien formula: a group of people on a quest to stop an evil bad guy to save the world. While there are many derivations of that, everything from the first DragonLance novels to the Shannara series essentially sought to emulate Tolkien. Now we're in a third generation of fantasy, with authors like Sanderson or Joe Abercrombie, where fantasy worlds moved away from a good guys/bad guys epic quest trope to a model to explore aspects of politics and society where the magic in the world can create a scenario that our real world can't really have, and through that explore very human experiences and character arcs.
AI could never do that. AI could make a 1,000 derivative copies of Shakespeare, or Tolkien, or Robert Jordan, but it can't make the first one. It's only got what it's trained to do. And more importantly, Tolkien had the influence he had because people bought it, found it interesting and it was very successful, leading to a movement. People decided it was good, and so the genre was born.
When I need a fast hack-story to make my DnD campaign, or give my kid 5-10 different ideas for a story prompt to write about for his narrative writing homework, AI is fast and easy because it doesn't need to be good. But good novels, good literature, and new ideas, they can only come from humans and only humans can decide if it's good or not. AI can simply regurgitate what's there, often in a way that is somewhat less than the sum of it's parts. Is there a place for that? At my gaming table yes. But I do like Sanderson's views on this: books are an art that is participatory; the author writes 80%, and you the reader fill in the visuals, the voice, the tone and make your experience unique in collaboration with the human who wrote it. There is a soul to a well written book by a good author, you can just feel it, and what AI writes just does not have that soul or same experience; it simply isn't there.