What writers of fantasy, science fiction, and much historical fiction do for a living is different from what writers of so-called literary or other kinds of fiction do. The name of the game in F/SF/HF is creating fictional worlds and then telling particular stories set in those worlds. If you're doing it right, then the reader, coming to the end of the story, will say, "Hey, wait a minute, there are so many other stories that could be told in this universe!" And that's how we get the sprawling, coherent fictional universes that fandom is all about.
Neal StephensonWe see everything from the narrator's point of view, so exposition about the world is limited to what impinges directly on him and the story he's telling. Considering how old the world is, we learn very little about its history, which I think is a good thing.
Neal StephensonYou should not believe a thing only because you like to believe it. We call that 'Diax's Rake.
Neal StephensonBut I'm not a small-literary-novel kind of guy, and once I'd developed the world in the first couple of hundred pages, I felt that there was potential here to go on and write an engaging story set in that world. So that's what I did. This probably ruins things both for the people who want small literary novels and for those who want action-packed epics, but anyway, it's what I wrote.
Neal Stephenson