I see you ignored the problems of hijacking and liability.
Here's another one to ignore:

Customer: "The robot delivery is here, and the X I
ordered is missing/incomplete/broken."

Service: "Well sir, it was there/complete/functional
when it left."

Customer: "I don't care, it's not now, and I'm not going
to pay!"

Who's right? How to resolve these disputes?

The economics of robot delivery just don't add up. With
big ticket/infrequently-used items, the time & cost of
delivery or picking it up are but a small fraction of
the price, so automation provides little benefit. You'd
want to go the other way -- i.e., flowers or candy, etc.
But there, one hijacking or accident wipes out all your
economic gains.

All I see are lame justifications for some geeks' wet dream
of robot vehicles; a hammer solution reaching desperately
for problem nails that don't exist. You can ignore the
real world, but that doesn't make it go away. Most people
don't want this and there's no advantage.