We have a world built for humans, designed for humans to walk around and get things done. How, exactly, would it not be useful to have a robot that looks, walks, runs, jumps, lifts, carriers, pushes, pulls, twists, bends, steers, and labors like a human? It would obviously be incredibly useful.

As a person who works in a factory, areas are changed drastically, regularly, and quite fast. The cost of adapting areas to accommodate purpose-built machines pales in comparison to making robots work in suboptimal ways. It's much more cost-effective to rebuild a production area for very specific machines (something my workplace does frequently but never seems to replace workers) than it is to engineer and manager a machine to do work that's already best-suited for human workers.