It's less about being able to do everything a human can, and more about being able to exist in spaces that were meant for humans. The vast, vast majority of set

It's less about being able to do everything a human can, and more about being able to exist in spaces that were meant for humans. The vast, vast majority of settings were built operating under the assumption that a 5-7 ft biped with a similar armspan and effective hands would be using it. If you can make a robot that fits that description, the replacement story is a lot better.