Does that body of literature say anything about in-person interactions in the workplace?

Specifically the workplace. An environment that a breathtaking number of people do not want to think one second about outside of work.

I havent read about workplace interactions as an intervention for loneliness and depression. It would be hard to run a RCT on that, so you would only be left with correlation.

I dont know why making it a more pleasant experience during work has anything to do with how much someone thinks about it outside of work.

Because not all human interaction is equal. It equivocates talking to a cashier at the grocery store to hanging out with friends.

I don't think that's the comparison I would make.

I think the comparison would a workplace where people can take a break and chat with friends, vs one where they spend their breaks in isolation.

Alternatively, a workplace where a grocer talks with customer while filling an order vs one where they get a packing list from a machine and puts it in a pickup box.