In general point of fact I find genre a less and less useful category these days; people who like space opera of the Lois McMaster Bujold type will love the Lymond Chronicles, which are historical fiction with an emphasis on the historical, & might even go from there into liking The Name of the Rose, and so on. Or, to rephrase: I think it's setting-genres that I find pretty useless, as opposed to story-genres. A techno-business thriller scratches the same itch if it's set in 3092, 1980, 1912, 422 BCE, or The Seventy-Ninth Year of Odegra and Ancient Mu in the sub-duchy of Cazabel on the Blighted Planes. :)