Yeah I never really got why people made that claim. In my experience, the door close button works fine after some minimum amount of time. Elevators I've used that are primarily for folks with significant mobility issues or maybe where they're carrying a lot of stuff, like for a Hotel catering kitchen, seem to stay open a bit longer. In one hotel I used to get Zipcars from a lot, the elevator to the parking garage would stay open for like 30 seconds if you didn't hit the door close button. It was like that for well over a decade so I doubt it was just misconfigured. Elevators in professional or residential buildings that need to optimize for the number of trips just have a different use case, so the door closes much more quickly.