And sometimes we have a leadership meeting where I fly into the corporate HQ, as do my coworkers, and we have an all day in-person meeting with no one remote. And it's amazing how much we can get done in a day.
Sometimes it's just a lot easier to discuss a contentious subject where we don't all agree in person, and see body language, and not have to deal with the weird gaps that happen with online meetings.
That being said, I won't ever return to the office full time. The boosts in productivity only happen because it's not a regular occurrence, and it's a huge hassle to get there and back.
But I do see the upside to occasional work in the office.
Also, I used to work at a company that had no remote employees, so we were all in the office every day. That was nice, because if you needed to talk to someone you could just wander over and hash out an issue right then and there, and you could have meaningful hallway conversations, and we were just generally closer as humans. But that only works if you have no remote employees, and I'm not sure that's feasible anymore, at least in software. People got too used to remote work. But if I ever found a company like that where everyone came in every day, and it was close to my home, I'd be willing to do it.