This was a plus that Microsoft Combat Flight Simulator 2 had over IL2 from day one in my book.
Three things that I miss from CFS2 are:
1) The whole world modeled, not just maps, so good for long missions. (Although the world looked like cr#p when you got within a few thousand feet of the ground, there were no trees or waves, and the world looked very empty in places where there was no scenery placed.)
2) Much better weather modeling in the mission builder, which allowed you to set cloud layers, percentage of overcast, wind speed and direction, etc. (But, it didn't snow and the clouds still didn't move.)
3) You actually had an LSO (actually a little graphic of an LSO in the corner of your screen) when you tried to land on a US carrier.
Other than that, I have no regrets about switching to IL2. Occasionally, I'll fire up CFS2 for old times sake. And, the first time that I "collide" with an airplane that's 20 yards away when I make a close pass, I'm reminded of the reason I switched.