Edit: to clarify, I know that many short hair styles don’t have a part at all. Mostly talking about people with hair long enough to have one. I find it interesting that many studies conclude that beauty is tightly correlated with how symmetrical someone’s face is. However, many haircuts and hair styles are asymmetrical, including any style with the part off-center (very common for both male and female hair styles). Not just that, but we really like the way these haircuts and styles look too. It makes me wonder why one’s perception of beauty might not take into account the symmetry of one’s hair. I don’t have an opinion on what looks better, symmetrical vs not symmetrical as I think it depends on the person and what suits them. I am wondering if anyone else has thought about this.
Because only a few people have a truly symmetrical face. Your hair acts as a sort of frame and so a middle part can end up emphasizing the imbalances that exist and thus make you look more lopsided. There are also additional considerations to a beautiful face. Symmetry is one, proportion is the other. You can have a very symmetrical face but if your features are smaller or larger in relation to it as a whole, then that can ding off a few points on the “beauty” meter.
That’s why asymmetrical hairstyles can work so much better. It can shape your face in accordance to its symmetry and proportion and thus make it appear more balanced.