One thing holds true in my opinion. As soon as you open (any) software where end users are able to create and modify its content, they are creating diversity which will effect their multiplayer interaction. Compatibility was never an issue with the closed IL-2 as far as I remember.
Second, you may or may not agree with me, but for me the biggest drawback is that the IL-2 community forums topics seem to have shifted away from virtual flying discussions. There are many posts regarding modding IL-2, but so much less talks regarding actual virtual combat flying. It feels a bit to me like those car tuning communities, where you spend more time in the garage than actually driving the car.
Just my 2 cents. Peace.
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