Hmm, i’m not following you because you are mixing AC & DC & the rules of physics. If what you suggest was true all AC circuits would be wrong 50% of the time because the current goes both ways, if it didn’t the circuit would not work, period.
What you are suggesting is that ALL wire, including the wire in your home, inside your speakers, your amp, your pre-amp, etc for example has little arrows on it so the electricians know which way to wire your home, god forbid they have a "oh crap" we put the wires in backwards! The little arrows don’t exist because there is NO directionality in wire, electrons don’t know the difference!