last generation before self-driving trucks with robotic delivery arms? true, parcels and overstuffed mailboxes would challenge robots, but the difference in co

last generation before self-driving trucks with robotic delivery arms? true, parcels and overstuffed mailboxes would challenge robots, but the difference in cost would be so extreme, it would still be a net win... heck, you might be able to deliver mail more frequently, then send electronic notifications to users that their mailbox is full !