Do they leave them all the time because of a return-to-office policy?
I really doubt that most people would give up a job in a satisfying office environment with people they truly enjoy working with on a product/project they are excited to work on everyday simply because of they are told they have to go in and meet those people they really groove with three times a week.
Think of that. Some people were spending 4.5 hours commuting every day. And it was ok with them.
It is possible they are avoiding something at home so this suits their lifestyles. That would be my guess.