? just spitballing

1> psychological cuckery (ie sign of prestige if you don't have to wear a mask)

2> A.I bullshit

3> Even something to do with sound ?

4> literal aliens are here and their culture literally has see #1 (who knows maybe where they're from only elite pooliens have mouths) or they have some sort of issue pertaining to vocal communication see #3 (also backs up the crazy level that sign language is pushed on tv) or there really is some kind of airborne element that effects them or us. I doubt that concealment methods are glitching or something like that or that there's some kinda weird vampire shit like the strain going on or spawn or some shit, I rule that out.