It is actually a well known fact that many authors who are working in the genre of fantasy or science fiction do not necessarily view themselves as science fiction/fantasy authors; and instead write about humans, ideas, history and pholosophyphilosophy etc...; with sci-fi / fantasy being merely plot devices they employ.
Among the most well known-known of these are:
StanislavStanislaw Lem
Brothers Strugatsky (whose importance to Soviet sci-fi can be thought of Heinline+AsimovHeinlein+Asimov put together)
Going further back, Bulgakov and even further Gogol.
And, going even further, heck, why not Homer?