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That cherry-picks examples, phone numbers and chronic conditions. We can think of plenty more that change. (Even phone numbers change sometimes.)

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Cherry picked examples are proof that the OP is wrong, at least to an extent, and that there exists data that doesn't change or changes slow enough to be re-tagged (and this poses the issue in question).

Proof of existence is enough to invalidate a claim of non-existence, even if it doesn't hold for any condition in the world.

No comments were made in the context of logic, so the logical forms don't apply. Personally I'm interested in the long-term value of data and not a logic contest - I'm interested in the territory, not a particular map of it.

Sure. But what if those two data points are the only things I need to tag and target you.

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