I've thought about this every time I've watched a movie or played a game where the character has a robot or prosthetic arm. (Deus Ex, the Winter Soldier, Darth Vader, Altered Carbon) They show the characters lifting a person up or another heavy object and throwing them. Now even if you consider that they attached it directly to the character's skeleton, would the rest of the body allow them to do that or would the arm just rip off the body? It seems to me like the rest of the body couldn't support the weight and then stress of throwing the person/object. The writers act like the arm is a self contained mechanism, but the body would still have to support it even if it was capable of lifting that weight. Obviously we're not supposed to think about it, but it just doesn't seem like it would work without a very solid support.