Aside from mechanical challenges, what was missing that may have spurred personal robotics development was a dedicated programming language specifically for robot control and communication.
This was accompanied by a proprietorial admission that French has decisively lost the battle for status as the world language and that English is now the established global means of communication, for practical matters and for a growing range of cultural ones.
Body language was the basis for our earliest form of communication when the split-second ability to recognize if a person or situation was benign or dangerous was often a matter of life or death.