I think gameplay wise it would be better for all of us if the battles are fought one at a time to allow us to have larger battles. If they allowed concurent battles, they would have to be prepaired for the eventuality of all 80+ systems having battles going on at the same time in space and on ground. That would be a possible 160+ battles going on at once. Very unlikely, but that is how you design code well, you take the extremes to form the boundaries and then you have to make sure everything in between is handled.