[asdf99]

while this is true, there was always transitional periods that you ignore.

paper was once issued by a bank clerk while taking your gold or other goods. the govt started to issue them and allowed you to exchange back to gold at any time. eventually they undid all that.

checks and credit cards also are tied very closely to existing monetary concepts to start off.

bit coin start alone. that's why most people consider it crazy. when money was being adopted, if it failed you could still use the coin metal or exchange it to metal. if bit coin fail, though luck.