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Because Superman is a product of a contained system- that's beholden to restrictive laws- and already at an evolutionary peak-
Iron Man would eventually be able to destroy him.
Technology enslaving Nature.
Superman hits an evolutionary plateau- but the potentiality of Iron Man is theoretically limitless

Because Superman is a product of a contained system- that's beholden to restrictive laws- and already at an evolutionary peak-
Iron Man would eventually be able to destroy him.
Technology enslaving Nature.
Superman hits an evolutionary plateau- but the potentiality of Iron Man is theoretically limitless