But in the GP's vision, it would become idiomatic: >imagine a society where everyone is so polite and flattering each other If it were to become pleasantries

But in the GP's vision, it would become idiomatic: >imagine a society where everyone is so polite and flattering each other If it were to become pleasantries like our, "I appreciate it", "sorry about that" and "would you mind", I think it would be amazing for people to talk about changing their mind, even when they don't fully mean it.