The high performers work better, but half of the rest workers are doing nothing. I’m aware of people getting canned for stuff like outsourcing themselves, accidentally having sex on an open mic, illegally exporting computers to countries with export controls, etc since COVID.
Work at home is great for people with tangible outputs. I don’t want my salesmen fucking around in the office. But many workers with less well defined outputs are going to be harder to manage, and being in the office kept distractions away.