The problem with gold is that you
The main merits of gold are portability...
???
Have you ever tried to carry it? It's not exactly lightweight. One of the last things I'd want in my backpack. Right up there with Mercury and Uranium.
God is portable in the amounts that most us are likely to possess. Many thousands of Ł/$ are easily carried. High denomination paper money is lighter still, and a bank card weighs almost nothing, but the whole point of gold is for situations when paper money or banks are, or are likely to become valueless.
The problem than become, how do you trade gold to something you can use? First of all, I and most people don't have much idea how much a gold or silver coin will be worth, without looking it up. And looking up would be to check the value in money term. But if money is worthless, then how much is gold worth? Besides, me as a simple guy and not a gold expert. How do I tell the difference between a real gold coin and a 'replica' from china. And how do you give back a form of change? I mean buying a chicken with a Ł/$250 gold coin seams a but problematic...
I can see how gold/silver can work if you need to move from a country in distress to a safe country. Currency of a country in economic disaster will be worthless, but gold will be valueable to exchange in a country where the economic system will be working.