Hifitime,
While what you're saying is absolutely true, because the sound/electricity is theoretically modulated by what it passes through and because you can't actually hear each and every one of these changes, it ultimately doesn't matter. Let me explain:
Let us say that the sound passes through copper, silver, aluminum, copper, in that order. It provides sound A. Another time it passes through aluminum, copper, copper, aluminum, silver. This is sound B. Even though both create a different sound, perhaps better, perhaps worse, adding yet another metal will likely change the sound again and replacing one of these metals may improve the sound; I would find it difficult to believe that adding more transitions would improve the sound, but if you replace an inferior conductor with a superior one that could improve sound.
Anyway, my point is that, regardless of how many metals the sound has moved through becomes somewhat irrelevant since it still produces a final sound you have to live with on a daily basis and MIGHT be able to be improved upon. That said, I'm not trying to defend any particular 'tweak', just saying it is a theoretically attainable end I think.
As an aside, when I type your name into my iPad hifitime, it tried to write "hotly me". Does your name have a secret meaning perhaps? ;)