"This theoretical failure to find a plausible alternative to quantum mechanics, even more than the precise experimental verification of linearity, suggests to me that quantum mechanics is the way it is because any small change in quantum mechanics would lead to logical absurdities. If this is true, quantum mechanics may be a permanent part of physics. Indeed, quantum mechanics may survive not merely as an approximation to a deeper truth, in the way that Newton's theory of gravitation survives as an approximation to Einstein's general theory of relativity, but as a precisely valid feature of the final theory."
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Steven Weinberg, Dreams of the Final Theory (1993), Ch. 4. Quantum Mechanics and Its Discontents
https://en.wikiquote.org/wiki/Quantum_mechanics
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Quantum mechanics
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