This has been my experience too, and I don't think I'm being nitpicky when I say that there is a large dropoff in reliability from UPS/FedEx to Amazon. I would

This has been my experience too, and I don't think I'm being nitpicky when I say that there is a large dropoff in reliability from UPS/FedEx to Amazon. I would estimate that the success rate in receiving my package on the scheduled date is about 50% with Amazon and somewhere around 99% with UPS/FedEx. I live in a condo building which requires fob access, and while the UPS and FedEx drivers have a fob (because it's the same person every day making a large number of deliveries at once at the same time every day), the Amazon drivers do not, so must stand awkwardly outside the building until somebody maybe lets them in, but is usually denied access because letting them in is a violation of our building policies and can result in a large fine. This in turn results in many packages either being left outside the building on the ground, or not delivered at all. I think the main problem Amazon is going to have with trying to vertically integrate into deliveries is that they alone don't constitute enough volume to keep drivers employed full-time, so they would have to open the service for outside consumption like they did AWS.