My 76 year old sister is still doing a weekly permanent. She complains about how much time and effort she spends. I have urged her to cut her hair shorter. She looks like an actor portraying a character from the seventies. She would rather complain.
In my mind, your sister’s unwillingness to change her hair style can be writ much larger.
In north Korea, the old men around Kim are unwilling to change that which is comfortable and what they know.