Only sacred with some tribes. Others pulled out most of their heads as did the Mohawks, Iroquois and Pawnees and eastern tribes.
I am reminded of a young Indian man back in 1974, with long hair down in Oklahoma. His pride was his hair. While working on a jacked up auto with the drive shaft turning it got caught and “POP!” No more hair. Last I heard he was wearing a wig.
Long hair is not permitted around any rotating equipment where I have ever worked. Even the American Indians there kept it short or under wraps.