Just as soon as you find me an example of samurais fighting with morningstars alongside plated knights with katanas and every other combination of arms, armor, fighting style, aesthetic, etc. you wanna pick from a typical crpg battle.
My point throughout has been that any argument you can make to exclude dual wielding, is an argument you can make to exclude most other things from the game. And since that would leave nothing, we shouldn't do so. And if we're not doing so for any other aspect of the mod, why does the buck stop at dual wielding?