From what I could find, men are more likely to suffer from dandruff than women, so even though women can suffer from dandruff it makes sense from a marketing perspective to focus mostly on men, especially since men are still thought that anything even cosmetics adjacent is not manly.

Its my understanding it does, but is generally far less noticeable (gets caught and held in hair, then washed out when bathing) but is usually cared for / treated by using proper hair products.