I agree with Sylvius, in regards to his original point.
If the player wants to head-canon that the Inquisitor is the OGB, more power to him. It doesn't affect my game, why do I care?
It's the same reason I'm not in favor of mandatory face tattoos for Dalish. Some people don't care (or know) about the lore reasons behind the vallaslin, or simply just choose to ignore it. That's fine. It's their game. *I* care about the lore, so any Dalish I play will have the tattoos. And that's my choice.
It's the same reason "beauty" mods don't bother me. You want to make Hawke into a supermodel, or have all your characters run around nude... whatever. It does not affect my game, or the lore of the overall Dragon Age universe. It's contained within your own playthrough, so feel free to enjoy it as you please.
Same reason "player-sexual" romances don't bother me. In one game, Fenris is gay. In another, he's straight. They are separate games, and separate experiences, and separate Fenrises. (Consider it a sort of multiverse).
It's the same reason I'm fine with mods that allow male Wardens to romance Alistair. If you want Alistair to be gay in your game, cool. It's your game.
However, I don't believe Bioware is under any obligation to support your use of mods. If you import a save where a male Warden romanced Alistair (which is not technically possible in the game they made), and it throws up an error message because of a technically impossible "bug" and corrects it so they never romanced... that was the risk you took using a mod. Though you may of course head-canon all you want at that point.