I agree that many jobs can be done remotely, but I don’t assume that everyone prefers it; I have no interest in giving up a portion of my home to my employer.
In my experience those most resistant to returning to the office have the longer commutes or tolls; those most receptive to returning are those who live alone, for whom work provides a good portion of their socializing.
A third reason is that WFH allows one to avoid much of the office politics and drama.