I tend to look at it as 3 separate genres:
pure sci-fi (based mostly on science, with a little fantasy fiction to keep it interesting, without the fantasy part, it would just be fiction based on science, not science fiction)
fantasy sci-fi (combining the two, like using science aspects while talking to 3 legged aliens or dragons from the dark ages type of view)
pure fantasy (based primarily on fantasy, with a touch of science added in)
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