I tracked down this Book because I have fond memories of Glory Road which was the only other fantasy, I recalled written by Heinlein.  This was disappointing, not that the stories but the fact that I didn’t really see them as fantasies.   It was more lip service with mention of magic.  I guess they could be considered early urban fantasy but I felt they fit more with his general body of work than in the fantasy genre.  

My impression of Heinlein was that he was a frustrated philosopher.  Much of his work struck me as proposing a different way of seeing and doing things.   These stories had some interesting twists and I did enjoy them.