Not the US, but no manned registers happens often enough across various store chains here in Dublin at least. To the point where you might have to wave down a staff member restocking a shelf because the self-service needs someone to authorise your alchohol purchase or whatever.

Walmart seems to agree that they like them as well. Renovated stores are entirely designed to streamline the self-checkout experience.

I don't mind the OPTION of self checkout, but not having the choice is a big fuck-you to the customers purely to make more millions of profit. At our local Wal Mart, they have registers for humans, but no humans are ever there. 100% do it yourself, with someone wanting to check your receipt. I never stop, if they want to see it's done right, hire someone to do it right.

Home Depot is getting to be that way, though you can go to the "professionals" checkout if you need human interaction, and they don't seem to mind us plebs doing so if there aren't contractors waiting. And they have the cust. svc. desk too.

Recently, our local grocery store has started a "no humans" checkout after some arbitrary time of day; I think ~17:00. This is 10x worse since there we tend to buy things that require human input; notably produce that isn't pre-wrapped and pre-priced and goes by the # for cost.