I think you have a misunderstanding of what proprioception is. Proprioception is the built in feedback in your body together with the right processing which ma

I think you have a misunderstanding of what proprioception is. Proprioception is the built in feedback in your body together with the right processing which makes you know how your body is oriented and how is it moving. This is independent of sight and touch. Imagine a robot arm. You have the armature and a beefy electric motor on it. Your task is to make it do some manipulation task. If all you can do is send voltage to the electric motor you will never succeed. You don't know where the arm is at any moment. But even if you would know where it started from you couldn't know how much it moved exactly just by knowing what voltage you sent to it. This is because minute variation in loading and tinny errors would accumulate into huge uncertainty in such an open-loop system. So basically you need something to close the loop. A rotational encoder on your robot arm, or muscle strain measurements on a living creature. But just having the sensors is not enough. If you want to make the (robot or human) to touch a particular point in space you need to know how to turn the sensor readings into a transformation. I would be lying if I would tell you I know how exactly the human brain does this, but in robotics it's just a few transform matrixes multiplied together.