I can counter that with my own anecdote, this one from a large university setting, when somehow almost organically a large number of staff began "working" from home. At first it was a couple of people, and as others noticed that there were more and more people not in the office, they opted out as well.

Productivity went through the floor. Nothing got done. Nobody could get in touch with anyone.

After a while the mandate went out, almost apologetically, that people would actually need to work at the office unless prior approval from their supervisor was obtained.

Of course the work atmosphere was pretty dysfunctional to begin with (the secure setting of a university job attracts people who don't like to work very hard) but it was rather interesting to watch it play out.