"In the totalitarian-dystopian genre, the prototypical narrative content elements — e.g., setting, character, plot, and story morals — are relatively clear and consistent; thus, they are “filled in” according to widely shared genre conventions."
Writers can thus write in such worlds without extensive world-building. It's like grinding out police procedurals or zombie novels. Not every writer can build worlds like Charles Stross. It's also easier for readers. Reading Ian Banks is hard work.
More generally, we have a decided lack of novels describing a better future. We have no shared conceptual model of what a better future should look like. We did once, up to 1970 or so. To a considerable extent, futurism is still stuck in the 1960s. What passes for futurism today is a minor tweak on the present.
("Futures: 1) Utopia 2) Dystopia 3) the future in which your cell phone takes slightly better pictures.")