Science Fantasy is a legitimate genre. The difference between Sci-Fi and Sci-Fan is that Fiction usually cares about the technical details of the world it's created in, and fantasy is more concerned with the story. (Star Trek writers spent alot of time on the science of their world to make it plausible.) The details about how things work is what makes Star Trek Science Fiction. The science advisors would change the details of the story to make the science "facts" of that world more in line with our world's science.
If you just look at the Star Wars movies, they are mostly Science Fantasy. It's not just about the force, it's that the tech of the stories only exist to further the story along. If you don't believe me, consider this: The empire has enough money to build 2 death stars, why would they not put shields on their fighters? I mean, I literally just erased 5 more examples of the tech being used as a means to an end.
Now, it definitely has some western elements to it, but it's definitely on the science-fantasy end of the fiction genre.