You think it's stupid to have a unique token that represents value? Why have social groups been remaking currencies since the beginning of time then? Or why are IOUs so ubiquitous across cultures? It has to be to fill some needs like the ability to share a basis point of value and simplify transactions perhaps; You no longer need to know how many eggs for a chicken, or how many chickens for a pig, or etc ad infinitum, just how many of whatever the currency is?

To be clear I'm arguing from a number of perspectives here:
a) Some currencies are better than others and
b) Having any currency is likely better than none and finally
c) It's easier to carry a pocket-full of cash or a smartphone into a shop than a bushel of bacon.

Why do you think currencies are stupid and I won't accept that you're a troll as the answer?