Let’s say you’re right, for the sake of argument. Let’s say electrons vibrate and let’s say they somehow distort the audio signal. But as you say, there’s nothing you can do about it. So, why worry about something you can’t do anything about? Especially in light of the fact there are SO MANY OTHER THINGS you CAN do something about. You might as well wonder why the signal of photons can travel at lightspeed through a solid copper conductor without being distorted by ramming into something more substantial than an electron, you know, like atoms and atomic nuclei. Follow?
At the same time less wire does mean less distortion caused by the directionality being incorrect 50% of the time. That much I will grant you. There are other losses and distortions in wire and cable, too. You know, dielectric material, purity and type of metal, geometry, etc. So, yes, less wire means less noise and distortion.