From what I've seen, every push to have everyone return to the office has either been that they just want control over employees or they want butts in seats because the seats aren't free. It's never been about productivity as folks that work from home normally are always happy to drive in to the office if they have to. What's the different if they drive in during morning rush hour traffic vs at lunch time when they only have to physically be in the office for a few hours.
I think a large part of the push for return to work is definitely the control of employees when management actively selects for people who are sociopaths.