Never said it was always
the cause of damage. Genetic involvement is assumed, but the wild cards that can change porosity/elasticity are the things I described above (including not just damage, but physiological and environmental changes).
My main point was that a person can't necessarily rely on a single "hair property analysis" result, as some kind of permanent blueprint for what her hair properties will always
The bad news is: one set of results may not allow the person to find a hair routine that will work predictably for the rest of her life.
The good news is: she doesn't have to get too hung up on one set of results