In a single story, the sex of a character should be pretty irrelevent, yeah. But a pattern emerges, where most protags are male and most supporting characters are female. The emergent pattern is that "society says women exist to support men, and that only men (and, in slightly mor eprogressive pieces, exceptional women) are suited to lead." This pattern as a whole is dangerous and must be identified, addressed, and pressured to into dissolving if women are ever going to be equal, especially with what TV/movie cultures the West and industrialized East have become.