I didnt know that was true. Some famous people ive seen called really attractive dont have perfectly symmetrical faces. In fact for some of them its not too hard to notice the asymmetry but theyre still really attractive.. i think the amount that symmetry comes into play might not be as high as other stuff like the shape/size of features, if at all. but ya.
Also for the hair thing i think is just bc some hairstyles look cuter than others depending on the person. Not necessarily middle part for everyone tho is not bad.