Comment by MisterTea

You need feedback. I started with industrial robotics in the 90s and then having done a bunch of CNC and motion control: positioning is easy. The big problem to solve is enabling the robot to feel what it's doing and understand how it relates to the coordinate space. That's why we're dexterous, we can close our eyes and feel our hands in 3D space instead of just knowing a position in some coordinate system. We can put on a pair of gloves without looking by feel alone. I picture a robot arm similar to when you arm goes numb from sleeping on it. You can see it but it's dead. That's how a robot feels.