[GeeTwo]

Robots are scarce because of legal liability issues.

When your PC operating system goes awry, you lose a few minutes, or perhaps a few days of productivity. When your forklift operating system goes awry, you lose thousands of dollars in equipment, or tens or hundreds of thousands of dollars in medical expenses. This means that the amount of "bullet-proofing" required for a robot (meaning a computer that affects the physical environment directly) is more than is economically feasible for most applications. Plus, humanity still has a bit of a Frankenstein complex, and perhaps always will.