> This is a strange example because for a remote worker every other worker is "remote" so why would they ever exclude other workers from a group email?
That's the point. Remote workers normally don't exclude the ones who go to the office, and office workers should not exclude remote workers either. That's how inclusivity works in many other cases too - you don't rely on spoken communication if you have a deaf colleague, you don't send your blind colleague architecture diagram in PNG, you don't require attendance to after-work beers, because people have all the kind of circumstances that require them to be present for their families etc.
There is a small price of convenience for in-office workers, but the total result is better documentation of decision making, less influence from office politics, decisions being taken more rationally - and that is not even considering that you can employ people from different cities, countries and timezones.