> People who advocate WFH have similarly varied motivations, but none of their motivations require other people to change their behaviour.

Of course it does. Some people who WFH will want things like no mixed meetings - either everyone is in the same room, or everyone is entering the meeting from their own computer - there's an example in this very thread. And even if you don't go that far, there are various smaller ways everyone must adapt their behavior to properly support hybrid work modes, just like WFO-only or WFH-only.