It may have something to do with uncanny valley theory

"The uncanny valley metaphor suggests that a human appearance or behavior can make an artificial figure seem more familiar for viewers — but only up to a point. The sense of viewer familiarity drops sharply into the uncanny valley once the artificial figure tries but fails to mimic a realistic human."

So if they make it look too good but it's not 100%perfect it will look more awkward and make people uncomfortable