Yeah, uh, having to push a button and wait for it to get to your floor, and then having to wait again in case some asshole decides to interrupt your trip and get on and off? Or if some other idiot decided to button mash every floor before getting off?

Pretty much the least efficient system I've ever seen.

[His elevators are controlled by his AI. He never has to even push the buttons, back home. The doors just open and he zooms off to where he wants to be. And if JARVIS pushes the lift speed to the limit? Well.

Tony likes to keep moving fast.]