I couldn't say. However, routines for hair care vary based on culture and the hair's physical characteristics.
No not really.  Hair strength can be maintained though through hair care routines.  Just vary your routine according to the physical characteristics of your hair!
I just brown hair.  I wonder how many people have brown hair. Next to black hair, it's actually the second-most common hair color. Is there a reasons so many people have brown hair? I don't know why large numbers of them do, but I know that in general eumelanin controls how dark hair is. The more there is, the darker the hair. Does the color of the hair change anything else about it? Well actually the darker a person's hair color is, the more individual hair follicles they have on their scalp as well! Does that affect the strength of the hair?
Hair care routines differ according to an individual's culture and the physical characteristics of one's hair.