Also to some extent, impossible to train. If a person needs to feel the situation or it demands the full dexterity of the hand, then that is not going to be captured in training data. It's why the robots are being tele-operated, yes in part to demonstrate the mechanical bits work, but the tele-operation is the only way they can get training data. If you couldn't use a VR controller to do a task successfully, then they can't even capture the training data needed.