With my original bedtime story example, I was actually thinking about the kind of story you make up on the spot. Like the topic request comes at bedtime, and maybe the child even has feedback on how the story should go as you're making it up. The alternative of the parent quickly asking ChatGPT on their phone for a story on the selected topic just seems not as fun and meaningful.

I guess in Apple's example it looks like they're writing it as a document on MacOS, so I suppose they are writing it ahead of time.