Hi Pei!
Glad to hear you're still at it with il2. I play from time to time, though maybe there'll be more of it in the future. Right now I'm trying to finish this article that does a comparative study of the German Blitzkrieg combined arms concept and Soviet operational art. Hopefully, this article will open some eyes wrt the different methodologies developed by the Germans (and belatedly by the western Allies) and, more importantly, the Soviets. While it's common knowledge within the academic military historical community, such knowledge is still surprisingly little known among the general populace.