We must live under a blessed star. The last two places we've lived, if a CP package doesn't fit in the box, they bring it to the house. I can't remember the last time we ordered something important enough to have to sign for it; although our daughter has a sign or QR code or something in their window that passes for a signature (I guess the driver scans it). Anything beyond letter mail we do have to drive into town to mail.
If the government could figure out how to provide or pay somebody to provide letter mail to every part of the country at the same rate, CP would pretty much lose their raison d'etre. There have been a number of proposals, including reduced delivery days, weekend delivery (to complete with couriers) and providing basic banking services in small communities, but nothing seems to get acted upon.