I think the deeper problem is that it only writes happy endings.

A while back someone pointed out that Dracula, Sherlock Holmes, and Winnie the Pooh had all become public domain characters on the same day, so I tried asking it for a story that combined them — it read like I expected it to (a terrible premise written with middling skill), but it also insisted on wrapping everything up with a twee "and then all three of them went on more jolly adventures" kind of ending.

Likewise the time I asked it for one about alien invaders, where it wrote them turning (without good reason) from villains into friends at the end.