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I don't think it's been pointed out yet that the idea of cybernetics is fanciful to us, and many of us feel we would jump at the chance to have it, when its actually a reality, it could be the sort of thing that many people would never want.
In Star Trek: TNG, there's an episode where a character asks Picard why it isn't standard for every Star Fleet officer to have their eyes replaced by a VISOR device like LaForge has. They have the resources, and by comparison regular eyes are "weak", so why not?
Picard doesn't actually answer, but in the moment the subtext is clear: cutting off a piece of yourself is something most people just don't want to do, even if they could get something "better" that's artificial.
EDIT: That's to say nothing of cultural or religious reasons why people might not feel cybernetics is right for them.