I have crippling anxiety - and i overwhelmingly prefer a manned checkout.

Manned checkout:

Hi, here are my bags, paying by card, thanks.

Robot:

Unexpected item in bagging area
Try and flag a worker down
they are busy solving the above issue for 4 other people
wait patiently for a minute or two
the worker doesn't realise i need their help
have to go ask them for help
continue scanning my items
above happens 2-5 more times

The robot tends to have significantly more human interaction, it's slower than having a professional do it, and the human interaction is SO much worse.