This ^^^^^^^^^^^^^^^^^
Our Walmart is a large Supercenter. One of the many problems they were having like most, is theft. Mostly from people "forgetting" to scan several items in the self checkout. "Shrinkage" has gone way up since they started all of this.
So instead of having one person watching, monitoring, and assisting the self checkout, they now have at least 2. Sometimes even 3 during very busy hours / days and weekends.
In addition to that, they also have a person wearing a reflective vest that says, "Asset Management Team" at the entrance / exit, to check anything suspicious. (They still have a "door greeter" in addition to this, "Asset Person").
So now they have at minimum of 4 people at any given time, who are basically standing around watching like a Las Vegas casino. If they put these people on registers, that's 4 checkout lanes that could be running. Most of the time you're lucky to find one or two.
"Assets" would be better protected automatically. Because far less theft would be occurring if everyone went through a manned checkout lane. So now it ends up they're still using the same amount of people most of the time with self checkout.
And they are inconveniencing everyone in the process. (Most people with a lot of items don't like or want self checkout). The whole thing is irritating more people, than it is helping the store to save money. Which was the original concept from the get go.
And they are not gaining much, if anything. Self checkout isn't catching on like self serve gas pumps did.