My 4 primary choices were thought as a narrowing down of possible choices, of which there would be more, as these do mix well. As some of you mentioned, some characteristic settings are a cross-between: contemporary + sci-fi = post-apocalyptic, historical + sci-fi = steam/dieselpunk, sci-fi + fantasy = Star Wars etc.
Still, even in these examples, there's always the dominant element (e.g. Star Wars is mostly sci-fi, with only small amounts of fantasy).
On a side note: did you notice how often the creators choose generic sci-fi or fantasy? It's easier to make up own world and rules, rather than going through a painstaking research process as in the case of historical setting.
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