yes of course this fiat currency is very important for the world because without the fiat currency will make the world economy very difficult, with fiat currency can be used by many people who need it.
Well hope you wont mind but I am not agree with you, now according to me fiat has no value bit bitcoin has, now in a lot of areas crypto currency has taken the place of fiat currency because it is good, easy, profitable and source of earning as well, when people only use crypto so we can do with crypto currency what we are doing with fait but we cannot earn their same money with fiat what we are earning from crypto currency.