Nothing is built into the structure. I think folks are taking this for granted. You have to consciously create such structure regardless of the conditions. It's possible to have anti-social office environments too.
In person it is built-in implicitly, people will be social naturally by proximity alone. Anti-social in person environments are de facto considered problematic.
It’s not, but many people feel like it is. In order to uphold this via remote you have to make a concerted effort, which to people, makes it different.
I’m not arguing against work being only a part of life, but that most remote jobs cannot be broken down into pieces like an assembly line where socializing is unnecessary. Jobs cannot be completely compartmentalized.