Again... attrition warfare.
Getting kills is the the least important thing we do in this game. There is an endless supply of Fighters, Bombers and Armor at all bases.
Having better ACM skills or good gunnery skills as little effect on the game.... having a horde of players, that has an effect on a battle not kills.
In combat being a killer is important, but so is survival. Shooting down planes should be important, getting your plane home again should be just as important.