National Bionics Service.
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I can think of one reason: they need to function in an environment designed for human limbs.
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Not always. Besides, a major use of, say, hands, is to manipulate tools. But the dexterity required is difficult to achieve with bionics. But if the limb itself
is the tool, much of the problem is bypassed. It's the difference between trying to operate a power tool with a prosthetic arm, and having an arm that ends with a power tool.
Naturally it would need to be modular.