I wouldn't put too much stock in this. Asimov was a fantasy writer telling fictional stories about the future. He was good at it, which is why you listen and why it's enjoyable, but it's still all a fantasy.
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Asimov was mostly not a fantasy writer. He was a science writer and professor of biochemistry. He published over 500 books. I didn't feel like counting but half or more of them are about science. Maybe 20% are science fiction and fantasy.
https://en.wikipedia.org/wiki/Isaac_Asimov_bibliography_(cat...