My previous employer (~25 people) ran a test for six weeks and had everyone come in twice a week. The metrics showed no meaningful difference in output and we went full-wfh. Got a smaller office, to receive deliveries, and tasked one person from mgmt each day with being there to receive.

I believe in the socializing aspect of office work. I didn't care for a guy hired during the wfh period until we had a company team-building in-person event. I found out he was really great when we had dinner and beers. But that's about as much in-person as is required. Wfh works.