Drone delivery methods attack the aspect of delivery with the lowest value-added, and there isn't much evidence that it can do it more efficiently than current methods that get aggregated to a truck and then disaggregated on a route.<p>When you pay for a person to deliver something within the same city (the relevant range for drone delivery methods), well over 80% of that value is attributed to a human being that is capable of doing the following things: Finding obscure building entrances, knocking on doors, collecting signatures, backing up vehicles around obscured corners into loading docks without hitting trash cans and sleeping homeless people, identifying obscured address signs, pressing the correct buttongs on elevators, avoiding malicious dogs, and placing packages in places that are obvious to the recipient and non-obvious to thieves.<p>To be sure, this also applies to driverless-vehicle delivery as well, although the value-added aspect that is provided by humans is lower because the relevant range of the vehicles is higher.