What kind of meaning has this statement?
A pseudo crusade to convert those who play with male protagonists with female protagonists?
Lady said exactly why in the previous paragraph from the post you quoted...
In any case, thank the Maker for male players who do play female characters. The more it happens, the more likely rpg games are to keep developing female protagonists. In ten years, we might see that not only is providing a female option utterly routine in RPGs, but that you almost never see it treated as a primarily cosmetic distinction, wherein everyone still reacts to you as though you're male--such as in Dragon's Dogma.
I'd argue that anyone who likes playing female characters themselves should consider encouraging as many people as they can to do the same.
Though I will add one thing to her post. I don't completely agree with the cosmetic issue, but I will say that I prefer how Dragon Age does it. In the DA games it IS primarily cosmetic because there are no significant plot differences between male and female characters; all differences are in the form of pronoun use, gendered insults (mostly against women), the romance options, and other such things.
Imagine if in DAO the only person who was allowed to complete the dark ritual with Morrigan was the male Warden? Or of a female elf who romanced Solas had been allowed to keep their hand? As it was, I thought that the lore reveal of the vallaslin being tied to the romance was a shitty thing to do to ALL elf players.
But such is the way of Thedas, where the major religion is matriarchal, and women are in all levels of power and authority. The very concept of Thedas enables women to be portrayed in this way, which then in turn allows the female PC to go and do whatever without there having to be some special reason for why a woman is able (or allowed) to do this or that thing.
Sometimes this portrayal is rather odd in that the devs feel it necessary to remind the player that it is different from the real world, rather than letting circumstances stand on their own. There is one particular instance in DAO where you meet Isabela for the first time in The Pearl. You can talk to her first mate and express surprise that she is a ship's captain. He automatically assumes that the reason for your surprise is sexist, which I've always found odd, since there isn't anything gendered about the actual words said. To a female Warden, he wonders why you should be surprised, as a strong woman in a position of leadership, to see another such strong woman. It's forced, and brings the player back into the real world, from which the mentality in Thedas is said to be different.
That's not to say that there aren't instances of sexism in Thedas, because there are, but again it is different because the general mentality about women is different from our own world.