I don’t really have a problem with hard science fiction, and there’s some excellent work in it. I’m not a fan of military science fiction, but it’s a perfectly legitimate subgenre.
What I do object to is the assumption that science fiction is only hard SF. That has never been true; Hal Clement, who invented the subgenre,* was well respected, but not considered a major name. Isaac Asimov once wrote “there’s no science in science fiction”** and wrote the Hugo-winning The Gods Themselves based upon a scientific impossibility (as he cheerful admitted). Heinlein wrote “The Green Hills of Earth,” even though he knew that the conditions on Venus were nothing like that in the story and the ending of his classic “Waldo” clearly had no scientific basis at all. And, of course, the Ringworld is unstable.
This is different from consistency. The Gods Themselves is a consistent extrapolation on the error Asimov used. The Left Hand of Darkness takes some very dubious biology and uses it to explore all sorts of issues between the genders. Andreas Eschbach’s The Carpet Makers – the best science fiction book of the past ten years – doesn’t really have any hard science at all, but blows the reader away in every chapter.
The issue is tied in with Samuel Delany’s “red screamer” analogy (outlined in the notes to Triton). He gives the example of a society of children seeing a firetruck for the first time, and giving it a name “red screamer.” This becomes the name for it and, years later, a younger child comes along and asks why it’s called that. He’s told “because it’s red, and it screams.” But that doesn’t tell what the red screamer really is. Thus, people say “it’s called science fiction because it’s based on science.” But the words “science fiction” are a name, not a description or definition.
What makes SF work is good storytelling. But too often, readers (and moviegoers) are more interested in the accuracy than the story.***
I also don’t understand why people think science fiction is different from fantasy. The only difference is the in SF, the fantasy element has a “scientific” explanation. I put “scientific” in quotes because many elements of science fiction are not actually possible in the form shown. I have no problem with “indistinguishable from magic” science; some great works have been written that way (The Book of the New Sun, The Dancers at the End of Time).**** The important thing is the story and the characters; scientific accuracy is nice, but if those others are good, it doesn’t matter.
*Yes, I know that Verne did it earlier, but even he was willing to ignore the science – I find it hard to believe that he didn’t know that firing people to the moon in a gun would kill them all. Clement, OTOH, would not have allowed that sort of thing.
**Well, he quoted another writer saying it and said he agreed.
***This extends to other genres, too. It’s fun to find flubs in a movie, but to find some trivial mistake (which sometimes isn’t a mistake at all but is only due to the viewer’s not knowing the subject) and say it “ruins the movie” or “it takes me right out” is just the viewer showing off how clever he is to have found the mistake.
****Deus ex machina is different.