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The balance is basically razor's edge, people conditioned to still be people, but also have the mindset to make the utopia work, and as such are carefully pruned.
In-Universe, scientists tried to engineer a perfect, flawless human being, but the end result was a bunch of human-like creatures that were still flawed, but insisted they were so perfect they were insufferable to be around. They couldn't be killed, so instead they were exiled to some isolated island, where the Mary Sues eventually built a perfect-yet-flawed city.
Inverted: A Straw Dystopia - The author attempts to create the worst society he can imagine, but the result would collapse under its own weight in real life.
The scenario first looks like a communist state which works perfectly despite no sign of visible control or suppression. But then someone does object, which gets immediately noticed by the invisible surveillance and the dissident is discreetly dragged to Room 101 without anyone noticing.
The communist utopian society exists in an alien culture that has no concept of self, like a hivemind.
The dissident's treatment in Room 101 means that he sits down on a comfortable couch and is treated to cake and coffee while a friendly man discusses with him the theory of communism. He is persuaded immediately and decides to becomes the perfect citizen out of his own free will.
The communist utopia fails at first due to various issues but then the creator proposes scientific solutions - which in real world would bring their own issues.
The Mary Suetopia is a "Potemkin Village" set up to impress tourists and is obviously fake.