@Fastolfe, lol.
If one must differentiate, that seems practical as a most-likely rule of thumb. But there is also fantasy that rationally and scientifically explicates a complex world with complex technology (e.g. "magic" system, species such as fairies from an alternate dimension or alternate universe, etc.) given one or two initial scientifically implausible assumptions. Similar to initial implausible assumptions in a lot of SF. If there is a line between SF and F it is in many cases fuzzy, movable and undulating at author whim.
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