Just because we cannot identify any disadvantages does not mean that there are none.
replyImagine a foreign state-sponsored agent waiting at the door of a public or private decision-maker, convincing them to cooperate. Home addresses are no joke. Especially if you can grep through the whole family tree.
It is more or less trivial to find someone's home address now if you try at all. Thats my point on duplicated data in hacks.
replyIt really depends and I often struggle with it. How do you do it?
replyThe German Melderegisters, for example, are now far more interested in the stated reason for your data request than they were ten years ago. (Which is a good thing!)
Many things that are trivial in theory, given the right conditions, etc. are anything but trivial once you actually try to do it.