Industrial robotics are very well constrained and the environment can be adapted to them which is why they're successful. Was thinking more about consumer robotics of which robo vacuum is the only real autonomous product right now.

IMO the answer is that it's very hard to build reliable robots + AI even in simple environments and AVs are still very dependant on the driver. The size of the potential market if it pays off is huge but removing the driver completely is going to take a long time.