while that may all be true, historical significance doesn't automatically translate into good gameplay elements. for example, there are already a couple of maps with an overabundance of choke points in the form of bridges in the game, and i guess you'd agree those are not exactly fun to play on (outside of compstomps maybe).
I personally have always loved summer Rzhev with its narrow passages, for the bloodiness and stubbornness of the battles in this map. Blizzard, dirt system I really liked in the game and I think it makes no sense to add something really changing gameplay, some kind of uniqueness of the game that would then cut it out.