It's a lot simpler than that. The systems are not ready. If they had a turnkey system that could do it we'd have it.

It will eventually happen. Almost every grocery store has self checkout lanes now. But it took quite awhile. CVS finally got them in the last year.

Ditto for "driverless cars". Elon Musk keeps saying it's this year... eventually he will be right if he says it every year.