I don't usually respond to reviews as I usually find them rather worthless as most are usually three sentences about some fetish they disliked (and to that effect, I couldn't really give less of a fuck about star ratings), but. . .
FXFTF , 'physiology' has little to do with what you're criticizing. Physiology and Facial Expressions (the word you're actually looking for) only really exist within the spectrum of trying to understand/read someone's feelings either via said expressions or micro expressions. And to that point, it's more rooted within psychology.
There's a lot of data suggesting that facial expressions aren't as accurate people understand them to be. There's far too much variety from person to person for facial movements to have universal meanings for every single person. Maybe your views of Daz characters have warped what you think actual expressions look like, but human expressions are quite subtle. Watch a random scene from a
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. How many unique expressions do you realistically see? Two? Three? Humans are far less expressive than you (and Daz expressions sliders) make them out to be.