Some of it is also just changing regulations. Most new building developments (at least in Canada, but I’ve seen it in the US as well) don’t even have door to door postal service, they’re required to set up community mailboxes. An identical development built in, say, the 1980s would still have door to door service and is basically allowed to do that because it’s grandfathered in.
USPS has also actively tried to get people to move away from mail slots to boxes or community mailboxes.
So mostly age of the housing development and how inclined the local post office is to fight residents on delivery.
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