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robots have existed for more than 20 years though. Boston Dynamic's dog is 22 years old, Atlas 15-ish

What can I as a normal person use these robots for?

Nothing. They were designed for the military.

And what do the military use them for?

Supposedly as a sort of extremely expensive but basically tireless mule.

Computers also existed for more than 20 years before they started being sold to end-users.

And again, the robots market will probably not evolve anything near as fast as the computers.

We have had more than 10 years of robotic vacuums and yet they are still a fairly niche product.

Mostly just the cost, yeah. It will be like buying a car. The economics will have to make sense for regular people, while it starts popping up in tons of places and become a status symbol.