I agree, anyone can classify SF anyway that want if its meaningful to them.
And some SF is just too muddy to fit a strict classification. How about Heinlein's Stranger in a Strange Land? Yes, it includes space travel, aliens, and new scientific technology. It also includes references to ghosts, God, and angels/archangels. So is it pure SF, science fantasy, space fantasy, SF mythology, or what? And then what about the small population that took it as the beginning of a New Age religion?
Vic
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