First of all, you can go and grab some high powered binoculars or if you have an access to the real scopes, get one of those. You will notice that you can't hold it perfectly without any "jumping", even if you are resting it on something. That is natural thing, and you can't avoid it unless tripod is available.
I don't say that jumping should be very "jumpy", but it should be noticeable and natural.
Arcade means that
a) it is similar to other more casual games, such as Call of Duty
b) Current reticle swing is the same in every stance position (no problems with standing or kneeled positions, really, because swinging motion is okay when you are actually holding a gun, but , but when proned, we still have the typical swinging, even though gun should be more stable). This means that reticle swing pattern is not affected by the stance, which is not natural at all.

Do you have any arguments against it?