The quantity you need for gold to be as useful as it’s going to be in whatever application short of aesthetic/monetary value is so low that it just doesn’t make sense for its value to be tied to its actual use. So little gold is used for “real” applications that if that was driving its valuation , it’d be probably 10% as valuable as it is. That’s what people mean when they say it isn’t useful.
The quantity you need for gold to be as useful as it’s going to be in whatever application short of aesthetic/monetary value is so low that it just doesn’t make sense for its value to be tied to its actual use. So little gold is used for “real” applications that if that was driving its valuation , it’d be probably 10% as valuable as it is. That’s what people mean when they say it isn’t useful.