And we are still just at the beginning of our genocratic journey.
Look at 1984, it got almost all of the details wrong, and yet, many people say it is somehow visionary because it had a few things somewhat right. That's, I think, because almost all of it is negative, and because of that natural bias, we tend to think of these of more relevant.
Ursula Le Guin's The Left Hand of Darkness (1964) had gender fluidity, before it was called that. It was central to the story.
> Robert Silverberg's Son of Man (1971), whose protagonist is transposed into the Far Future and there experiences a wide range of ways of being human, including being female...
See https://sf-encyclopedia.com/entry/transgender_sf for many entries before 1990, or even 1900.