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If you are only interested in the data, sure.
But metadata is also very powerful, specially when aggregated
it can be, depending on the context and what metadata you get. it can also be useless or of very limited value, even in aggregate. it’s really a roll of the dice, depending on the case. while I agree that no data access would be preferable to a little, my point is that encrypting the notification contents (a step which app devs can and should take) provides far better protection than what the cops get now, which is all.