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What's the practical difference between an unenforceable and unobservable explicit instruction and a polite suggestion?

My point is not that Google is good or bad or that all the other kids are doing it. My point is that DNT is at current fundamentally incapable of delivering what we're asking it to do.

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> unobservable explicit instruction

It’s absolutely observable between the two parties that are engaged in the conversation, as it’s part of the HTTP header:

DNT: 1

The effects are, if any, are not observable.

Let's go with a change of phrase, then. What's the practical difference between suggestion and a clear and explicit instruction that is unenforceable and where the user offering the instruction cannot tell if it is being executed faithfully?

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