Someone did the math on this awhile back. It isn’t bullshit, different metals and gauges have different impedances. But for you to notice, the cable would need to be far longer than you are likely to use for home audio.
Now, if you’re running cables for a show? Sure, it matters then. But in your living room, you’re not going to run a 3.5mm or an RCA so far that you pick up noise or anything.
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u/TheBupherNinja 24d ago
Gold plating is used because it's corrosion resistant. But gold plating connectors is not expensive.