They should never have been sharing a section in bookstores…

David Brin weighs in.

NOTHING EVER CHANGES in fantasy novels!
Aragorn may be a better king than Sauron would have been. Hurray. Fine. But he’s still a freaking king. And the peasants remain peasants…Science fiction, in sharp contrast, considers the possibility of learning and change.

— The Difference between Science Fiction and Fantasy