Arguing that gold and silver derive value by the represented stored energy is labor theory of value. If I put a lot of energy into making you a clay dildo, would you accept it as payment for goods and services? You might like it for it's use, but the energy spent to make it is meaningless.
If the power goes out,
If the internet goes down,
If you find a cabal backdoor in your blockchain,
If future gov't regulates crypto exchange,
If gov't decides to track all transactions,
My gold and silver still work and are private