You never experienced life on board of a slow running, 2stroke 40MW diesel engine driven vessel I guess? But vibrations can render you vision blurry to even hurting if you even try to focus something at certain revolutions and certain points in your cabin.
But I don´t think wing mounted cannons or guns can induce such vibrations into the pilots seat.
I don´t mind the look of tracers, in my limited playing time (maybe 4hours of abt. 150 hrs in FMB logged via steam) I now don´t use tracers anymore. But I would like the option to switch off guns sounds, because in all the literature I read, it was mostly mentioned that the pilot could not hear the guns being fired, only notices the shaking and nose dropping of the plane, when he pressed the trigger. But that`s another story...