Is it because the criteria is wait time not travel time? Destination dispatch would avoid some extra stops on the trip.

I just visited a new building with destination dispatch, so it seems to be still around.

My EE roommate in college had to build an elevator circuit as a final problem. It was on a bread board and had a bunch of call buttons and had a motor and a clear disk with black squares so it could figure out where it was…. I think it was the simple algorithm…