>>1944320
Because if they tried doing cold war they would end up being a Wargame/WARNO clone that would fail just like all the other ones. Also, it's technically not modern anymore it's set in an alternative 2010s where Russia started going crazy with their military budget, many of the weapons in the game are no longer in use or obsolete. At this point, WARNO is the single cold war game of this kind that you should play, the others fall short.
I think another reason why is exactly why Broken Arrow failed before it even launched, modern stuff is just not fun to play with in a video game.