Perhaps culture and productivity is actually better in office. I'm remote and would like to keep it that way, but that's also an hypothesis to consider (Occam's razor). These big corps claim they're data driven, so perhaps that's what their data is saying.
Not only do I work less in the office - the quality of the work I produce is lower. I'm more stressed out about things that I no longer have the time for because I'm wasting time commuting to work when I could be taking care of chores and errands or myself.
If I ever have to waste 5 more minutes over water cooler chat about what someone did the last weekend I'm putting in my 2 weeks notice. I don't go to work to socialize and as far as I can tell that is the real reason people want to RTO. They quite literally don't know how to socialize outside of work and bugging their coworkers so want everyone to RTO so they have people to chat with who have no choice but to pretend to be listening and be courteous with them.
I actually have no idea if I would work better at the office. I work quite well at home, and it's certainly possible to slack at the office. Nobody is behind your back and there are distractions there too.
I would benefit for more interactions with my colleagues, that's certain. And I think I would have a better separation between work and life if I was working from the office.