>physically and chemically determine purity for a relatively low cost
No. Assays are expensive and time consuming even now, and were even more so in the past, which is why countries were able to debase their coinage, gold is a low trust money, not trustless. Gold (physical) fell from favor for transactional not economic reasons anyway, we'd still be using gold if we could transact with it as easily as we can transact with BTC.
Statist dullard. Nothing has inherent value, as money is a unit of account, what matters is that it can not be manipulated. Fiat, whether paper or CBDC, fail this test. Where you lose the plot is that you believe fiat provides something gold did not, but fiat usurped money for transactional reasons not economic. You can't cheat Economy, the Soviets proved this, we will revert to hard money (we always do), but it won't be gold as we now have something better.