I said nothing of Call of Duty, but only that this specific series deviates from a standard used by hundreds and hundreds of other games, in a considerable way. It deviates from THE standard, the only option that makes any sense.

Even if you want to say it's harder to raise a gun or your neck than turn horizontally, you have to realize that with practice or simply time living, trains your brain to move your muscles so that you get exactly what you want out of them. Having one single game series completely break everything you know about how you should move your hand or thumb, is like deciding one day you're going to walk around with 50lb shoes. Could you learn to walk like that? Yes. Is there any reason to do it if your goal is simple to move your body? Absolutely not. If you deviate from a standard used in not only the operating system but thousdands of similar products, you absolutely must allow the user to adjust if that is not their preference.

Your argument about 2:1 being somehow more natural is completely bunk. If you just consider preferences about axis inversion for one second, you'll see why. Some people have trained their brains to think of certain things with one of both of the axis inverted. Do you want a game to lock you into ONE unchangeable option, even though it's vastly different from dozens if not hundreds of other games you play in similar if not identical genres?

THEY ARE ABSOLUTELY WRONG to not include the option to change it the axis ratio, particularly because it deviates massively from the norm. If a developer likes that the best, sure, go ahead and include a slider, and even make that the default if you want, but to assume that every player must feel the same way you do about one of the most important factors of the entire game, is insane.