Im too busy keeping customers happy and winning business to stop and worry about where Im working from.
Full remote is a d-mb idea. RTO is a d-mb idea. My team has a lot of great work to do, fantastic customers and the collaboration is never a problem. We don't use email so the concern about long email convo's isn't a thing, teams is decisions made and done. Pick up the phone or go visit a customer.
If I work from home its to get work done, if Im onsite its because I should be. If I go to the office it is absolutely not to get work done. Go see a customer. There isn't black and white.
If my boss is more concerned about where i'm working from than what I am doing then one of us is doing it wrong.