I enjoy the series much more by just assuming that last book doesn’t exist and Arthur and Fenchurch get a happy ending. Er, I mean, what do you mean Fenchurch disappears into thin air?

Interestingly, the trend in 1940s SF was for humans to always be superior to aliens; John W. Campbell, the editor for Astounding, particularly liked this view. Asimov hated this trend, so that’s why the Foundation series has no aliens in it; as a result he could sell the stories to Campbell without having to write about the inferiority of aliens. It’s also why Asimov wrote a lot of three-law robot stories at this time, as he didn’t mind writing humans to be superior to robots.