First of all, this was a joke post - you have to be constipated to see it in any other way
Now, with regards to compatibility of add-on planes, I'm sure that all SoW versions will be compatible online, but imagine this: in IL-2 where everyone has the same choice of planes, 98,45% of the people whine about balance issues. What will happen when many people won't have the same choice of planes? Can you imagine this? I can and I'm already laughing !!!!