OP's proposal sounds like what happen when someone stumble upon a parametric table, sort it by a single column, pick topmost result, ignore everything else, and shouting why everything isn't made out of it.
Fun fact: If you're mains utility consumer, I'm pretty sure your electricity spend 90+% of its lifetime flowing through aluminum wire instead of copper. A much worse conductor than copper. I'll leave it to OP to figure out why it isn't using copper, let alone silver. I'll give you a head start so we'll only talk about technical characteristics and not even talking about cost or abundance here.