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The thing is, hair is equally as heritable, and immediately visible. As humans, we can see and categorise skin equally with hair.
The fact that we don't use hair as a major defining trait though is arbitrary. That's just social norms, nothing more.
We kind of do though. There's nothing official about hair types, but there's all kinds of stereotypes about people with certain hair colors, like blondes, or redheads. There's even some scientific evidence that people with red hair have higher pain thresholds.
Those are not major defining traits. They could be, but they're not.