A map name is different to a whole faction. Moscow outskirts could also be some village in Poland in 1944.
You're making this seem too ridiculous as if it was Germans and Americans fighting soviets. It's not like that at all. They were co-belligerents. We should take out moscow outskirts from multiplayer since the game takes place in 1944 right? Same with the majority of the maps. It's a video game, not a documentary or some movie.
A whole faction alongside another who never ever fought together is stupid.
Imagine you have a nice European looking map and suddenly while you are chasing off the Germans from that Belgian village in the snow, the Japanese start a Banzai charge! Yeah, cool! I´m in the middle of WW2. (- And at this point, the gaming experience is so fucked up, that I wouldn´t even mind nazi ufos flying over the map and dropping laser beams.)