> science fiction titles have become more abstract and less literal over time.

Not even abstract, just not completely on the nose. Just as a lot if fantasy is not: only two discord novels would match the author’s search terms even though you’ll find all five inside the pages. None for Malazan. Or Nix’s old kingdom.

And worse, 40% of the sci-fi terms pretty only allow settings of “future solar system”. Not one of the Foundation books would match. Pretty much no classic sci-fi either. Wells’s fucking The War of the Worlds would not, because for some reason (of having any sort of taste) it was not titled “the day Mars invaded planet earth through space and then was beaten” like some lone star light novel.