Amazon is testing an autonomous delivery cart. What it doesn’t show is where it starts from, how it delivers along its route, how one is notified it is waiting for you to pick up your delivery, and how it secures other people’s packages.
I do not like Amazon’s in-house delivery because it is not as professional as Fedex, UPS, or USPS. What I observe is that their drivers do not know their route and will “deliver” your package anywhere.. you might find in your neighbor’s back yard.