As far as I know, The People (whichever of them...) belong to the same racial grouping as the Inuit & Siberians. The racial tendency is to be sparse on facial hair. Not hairless, but sparse. Exposed hair in cold climes is prone to collect ice. Frostbite on the face is not a trait likely to be passed down the generations! If the original stock that are supposed to have crossed from Siberia & migrated further had evolved to have less facial hair, that would remain the case unless there were a reason to evolve more facial hair.