Money and currency are different things, money is ...
Currency is what is used in circulation ...
So what is "paper money"?
Gold ... has intrinsic value
No. It only has the value that we believe it has. Just like... fiat money!!!
The only difference between metals+land (aka physical assets) and fiat money is that they'll be around long after fiat money has gone away. Unless, of course, the government seizes it, it corrodes away (silver, titanium copper, etc), gets flooded out, is lost, stolen, misplaced, etc.
USD used to be a meaningful reserve currency before 1971, now it is not
If we had stayed on the gold standard, what would have happened to the US (and world, for that matter) economy when the population is growing faster than the new supply of precious metals?
The world population increased 75% from 1960 to 1999. Did the amount of gold increase 75% in that time? No. Population is going up exponentially, but the gold supply is going up linearly.
We also have more "stuff" (cars, bigger houses, TVs, gadgets, computers, etc) than we did 50 years ago. That "stuff" has to be paid for, which would require even more gold.
Thus, commodity-based currency eventually became unsustainable.