Edit: I was not saying gold and silver have no use, I was saying the argument that usefulness is dictated by whether you can use something to pay a mortgage is spurious.
Also, to all the people who say "what about X use of gold, crypto can't do that". Obviously that's true. However the vast majority of value in gold has little to do with its applications, it has to do with its scarcity. 9% of gold demand is driven by technology. [https://www.gold.org/about-gold/gold-demand]