These folks have patted themselves on the back for devising a solution to the last mile without then realizing that the hardest part of all was the last 20 feet.

They'll just ignore that problem, drop the package on my front lawn and then snap a picture for proof of delivery from 50 feet up before flying away. To be fair, at least one of the Chinese international carriers does that every time already -- pull into my driveway, open the window, chuck the package onto the lawn, and then drive away. At least Amazon still brings it to the front porch and 90% of the time even puts it in a spot where the rain does not reach.