I never went by their faces but what they did and when they did something.
I could care less if someone showed up in a Mcdonald's Grimace costume but if we're in a hand and I see those purple
hands move in a certain way by how I judge their skill level then there is a good chance that info might help me during a hand with other info like how they play or board texture.
I understand there are people that claim they can read people by their faces but I'm guessing those are elite of the elite players from what I understand and most folks don't have the skill level or the time put in at live tables for this.
This face covering thing seems more like the folks showing up with sunglasses at $1/2 cash tables, lol ie online players that have very limited time playing live and they're just going off what they see on TV.
80%+ of the fields you're going to play in low live tourns or even most holdem tourns like at the
wsop are rec players who can't pick up on this. And then you have more folks these days more worried about math and board texture so I doubt they're worried about seeing someone's face but more about some chart from some computer program.