To me, this is great too, and it's why I still enjoy reading fiction.
However, having conversational NPCs which can behave in complex ways isn't just about a story any longer, it's about a more accurate simulation. I want to see where the non-deterministic machine(s) can take me. I want to poke and prod and discover new mechanisms. I want to make my own story.
Once I was quite religious. I was discouraged from reading fiction by elders because they said it is a "waste of time" and "basically lies". In this way, whether it was written by a human or a machine is irrelevant if I can't tell the difference. I would have a qualitatively different response if I knew whether a human or bot wrote it, but in the long run I'm not sure it matters in cases where I don't know.