Did you try it?
I did. It takes basic characters and creates a generic outline story arc using Campbell's hero myth, then creates basic text for each step of the story. Nothing fancy. To turn it into something meaningful, you would need to edit, which comes a lot easier to people (myself, for sure) than starting from a blank page.
What I want this app to do is let me give more input into the basic story, so the outline is for the story I want to tell, not so generic. I would try this, and welcome the assist.