John Carmack@ID_AA_Carmack
I was on a cruise ship last week (Star of the Seas), and they had pods of 10 elevators in a circle, where you picked your destination floor on a pad, and it directed you to the correct elevator, which was often behind you.
It seemed to work efficiently, but multiple times I saw people tap their floor and just look away, conditioned for normal elevator operation, and miss the arrival of the elevator they were supposed to get on.
Addressing my normal pet peeve of interaction feedback latency would have helped — with all the fades and slides, it takes over a second for the first hint of the elevator to show up, and two seconds for it to fully stabilize. That may not seem like much in some circumstances, but it is plenty of time for people to look away. The elevator letter should appear instantaneously, maybe with some festive animation around it to hold attention that was on the button press.
Even better would be to add a localized audio cue from the elevator the instant you pressed the button, which would let you immediately know where it is without having to scan for the lighted letter.
(the Starlink internet on the ship was excellent, allowing me to get some work in at sea)