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5 years ago many people could and did swap components in their PC. Now try doing that with a modern smartphone or laptop.

Do you think this is an entirely new development? Wouldn't the statement "5 years ago people could do X with computers, now they can't" in fact hold true for the last, say, 40 years in the history of computing?

But the argument here is about the specific property of black boxes.

Computers in the olden days tend not to be hermetically sealed black boxes.

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