Make no mistake, there are plenty of literature-oriented sci-fi novels. Frankenstein was one of them that's taught regularly in schools, but there are plenty of modern examples as well. And I remember very recently a handful of stories on HN describing mathematical dating models. The problem is that the literature teachers aren't trained enough to discuss the STEM parts in any real depth; they're trained to think that readers are just supposed to accept the sci-fi assumptions in order to generate an interesting narrative conflict. And while that's partly true, it also results in throwing out a lot of really interesting discussion.