AI's need special training grounds because they don't have the benefit of evolution. If they don't have realistic bodies in a realistic environment they can't learn to solve the problem of locomotion and manipulation. Have you noticed the explosion of "AI Gyms" in the last few years?

As others have said, we're at a good point with vision and control, but hardware is still expensive, and this slows research. I expect dexterous robots in a decade, BD's already got one dancing better than me.