thestaggy
Honorary Master
IMO the primary, unspoken, reason is the cost of operating the office buildings. An empty or partially populated office building is bad for profit.
And these corporates have built palaces...
That and middle management need to justify themselves.
If people can work remotely and deliver the goods, proving they can self-manage, you can remove or at least thin an entire layer of management. I believe this is the reason why when a company is willing to be flexible on time working in and out of the office but leave it up to management, certain managers won't allow it.
WFH/hybrid is an existential threat to a lot of people in people management roles.