"What I don't understand is why so many buildings do not have these optimizations built into their elevators." I suspect the author has observed more residenti

"What I don't understand is why so many buildings do not have these optimizations built into their elevators." I suspect the author has observed more residential towers than corporate towers? Otherwise I would imagine he would find that these practices are usually followed. Except for the door remaining open one, I never see that... maybe a fire code thing?