I personally do not even necessarily get into the points about the reality of Thedas, because as Nefla was saying you already leap 30 feet around and fling a 50 lb sword around like it's a piece of paper. This whole additional business about women fighting is peanuts compared to that. How exactly do dragon's wings work, according to physics? Oh wait, dragons don't even exist, that's why these questions are fairly silly IMO.
The point from my perspective is that this is a freaking video game, you can do whatever you want, for the most part. Most females I'd wager would enjoy the game more if they had more female characters to interact with/play in the game. They would also take it as a sign that the game doesn't have any particular bias against females. As it stands, the "Important, fighting" roles are allocated primarily to men, whereas women are (primarily) the "advisors" who stand outside the fighting and give you tips and peppy speeches. This isn't sexist? If you want to suffocate their enjoyment for some abstract reality reason in a fantasy world (for some reason) go for it, but all that does is subtract from the enjoyment of a portion of people playing the game. If you care about the end goal experience of the person playing, there's no reason not to have it. If you care more about the laws of physics (again, in a video game, trying to entertain), and are willing to take away from the experience of the player, then you might as well forget making a fantasy game in the first place.
To be honest, it smells like an attempt to curb representation not in the direct "ew women" kind of way, but in a clever, oh but this would logically contract this or that. Never mind the other logical contradictions or why we should even really care about logical contradictions in a fictional world with fantasy things that don't exist in the first place. If I'm making a game, and I'm thinking character balance, I immediately think 50/50 split, pretty much without exception. With 9 characters at least a 4/5 split.