Because they're the worst
Maybe it was too icy to get to the house. They'll always bring it to the door if conditions are okay. If your house is on a steep hill then it is most likely that might happen if it's icy. Unless you put in a request to meet at the bottom of the hill, alternate address, or leave with the package and come back a different day when it's easier to get up. Anyhow, sorry for the inconvenience.
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