Summary of part 1 : It is cool now to say stuff it was not cool to say earlier.
So, 2. doing things in language that you cannot do in the real world. Well, we all know an example of that! :-) You are soaking in it.
In case that was too dense, or you are, what I mean is this: To speak of “we all know” is possible, but it doesn’t refer to anything in the real world, only to something else in the world of language. Sure, we kinda sorta know what I’m trying to point to, but not exactly because there is no “we” that does anything like “knowing”. You might know something. I might, too. Hi.