This is incredibly true. I worked in a robotics research lab in 2008. I remember hours and hours of solving both dynamics equations and spending time messing wi

This is incredibly true. I worked in a robotics research lab in 2008. I remember hours and hours of solving both dynamics equations and spending time messing with rotors trying to get a silly quadrator to move a few feet above the ground. If at that time you had told me that it would be efficient to productionize it today, I would have pointed out battery issues as well as a myriad of other reasons. However, the kind of progress we have had in robotics especially if you look at what companies like Bigdog are doing shows me how non-linear progress really is.