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The accepted answer to the first link you posted explicitly calls out:

> There is one class of data that you have to delete - and that's personal data that the user doesn't want you to hold any more. There may be local laws (e.g. in the EU) that makes this a mandatory requirement (thanks Gavin)

This is exactly the type of data we're discussing here. So no, contradicting the user's expectation when handling personal data is not a "best practice".

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