Notice how your crosshair jumps around with just the slightest mouse movement on the 12X? That's why you don't want the same 360 distance for all scopes. You use scopes for aiming, not turning around. Xfactor definitely affect both ADS and scopes in R6, however in R6 all scopes max out at the same 360 distance as hipfire (i.e. they can't get any faster), so at at a certain point it stops affecting the scopes.
You typically want aim sensitivity to relate to what you see on your monitor, which is why FOV as a factor even though it does not affect 360 distance. Tracking a target, flicking to a target or in one way or another react to what you see on your monitor. You don't run around through buildings and doorways zoomed in on your 12X scope
The concept of having the same 360 distance for all scopes is so far fetched most games won't even support this. MW being one of them: