In regard of technical development predictions in SF being partly hits or overshot and partly very behind reality I have already suggested to read as well Verne as Doc Travis some posts ago.
Even so called fututologists are able to epically fail in their prognoses. Why should an author not?
I repeat: Always judge the text with the tech level of its time in mind. Besides... What's currently technically possible and what's available were always two different things it isn't as if artificially slowing down or suppression of progress with the goal to maintain the status quo would be some new idea of the currently big ones in the market.
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