[dontbenebby]

But elevator operators also served as security - they knew the occupants and could spot trouble. CCTV can be forwarded to the police after a crime but it can't say "Hey, I haven't seen you before, what unit are you in again?"

[function_seven]

There’s a good parallel there. In a modern building, there may be a single guard in the lobby checking for badges, as well as RFID access control in each car. Similarly, most self-checkout arrangements have one cashier monitoring 4 or more self-service stations.