Good point; when countries “re-evaluate” their currencies, their people see their cash lose value quickly. I remember years ago when Argentina did it; they had a “bank holiday” where they were closed, but some enterprising people figured out that they could get money out in casinos in Uruguay - so they could spend the soon-to-be-devalued money in their bank accounts before it was decided that it was worth half as much/could only buy half as much.
Here’s another thought to add to the mix. Gold, salt, silver, wampum, paper - all used at one time or another as a medium of exchange and store of value - have no worth unless, plain, old-fashioned WORK is associated with them.
If no one ever accomplishes productive enterprise, what’s the use of money?