You have to consider the car/truck traffic it replaces.
Now imagine that instead of returning something back to a central warehouse, Amazon could have the next customer pick it up or ship it nearby.
Hopefully boxes would not be needed for most of this, too. And any online store(s) could do this.
But I would also love if they could drone the package over to my roof if I wanted to.
It's also something only the fitter half of the population can realistically do.
I'd imagine there's some overlap of "people who race cars" and "people with aftermarket exhausts."