Control. The old guard of large business cannot stand that people have their own lives away from work and how will they know that someone is actually working rather than collecting a paycheck?
Not odd at all. First-level managers may still have a tenuous grasp of being an empathetic person, but managers of managers are only interested in growing their kingdom. To that end, WFH makes it harder for them to demonstrate a need for more headcount.
Let me make it very clear: Employees that WFH are more productive, so you don't need more of them. If you don't need more headcount, the executive has no use. If the executive has no use, they will be executed (symbolically, as a re-org).
It is impossible to hide doing WFH like one can do “endlessly” collaborating with your colleagues at the office.