Regardless of productivity (I think it's been shown to be better for WFH or at least equivalent), companies do not like WFH because it gives some power back to the worker.
Culture and relationships can absolutely be built remotely, but it does require leadership to be deliberate. Another thing highlighted by WFH is just how bad leadership was/is.
Spot on, wfh is the practical answer that managers are useless for the most part, and most workers can actually work together and be productive without the circus that a lot of companies do as a “team building” activity. But wfh took some of the power play that companies used to do, and they want that back.
Not sure about the generic 'manager', but leadership is not useless. In person allows a lot of bad managers/leaders to just skate by b/c everyone is in the same office, and things sort of get done by virtue of location. Remote highlights poor leadership.