But that's not actually simpler; there's two more solutions to whatever problem that thing is trying to solve: Self-service / buffet style restaurants, or the little conveyor belts with continuous dishes you see in Japan.

The complexity comes when you try and retain an existing workflow by a robot. You see this same thing when it comes to package delivery or warehouses, where they try to replace a human with a robot instead of redesigning the whole process as robot-first (this mainly aimed at warehouses btw)