Scenario:
Apocalypse happens, but the worldwide internet still works.
But you and your family find yourself starving for food, about to die.
You have 10- 1oz. gold coins.
You meet a man on the street that has two chickens.
You ask to buy one of the chickens.
He asks you if you have some bitcoin.
You say you don't.
You then ask him how much gold would he take for one of the two chickens.
He says all 10 of your gold coins.
And you know what? If you're family is starving, you'll give him all of them or you will die.

Congrats, you just paid $13K for one meal for your family, and now you don't have any gold coins left.
Even if you haggled him down to just 1 coin, you still probably overpaid.

Yeah, gold is so perfect as a form of barter.