The Slow Elevator Problem. Upgrade the elevator to the newest and fastest model. Waiting for an elevator can be frustrating at times.
He was sharing the curious story of the elevator problem. Instead of insisting that the problem lies on the elevator the new orientation was solving the problem of waiting too long. Naturally without any other support available the elevator is now moving downwards.
One single why question gives you clarity.
So they went off to design elevators that were faster and safer but at the time it was very expensive to do so. Elevators are slow. Stagger break times for the staff in the building so not everyone is using the elevators at once. Just like what happened with the slow elevator the objective shifted as they broadened their understanding of the problem.