Earlier quoted context omitted.
But cryptocurrencies were designed to be deflationary which makes them shitty currencies. There's no point in spending a cryptocoin today when its value will be higher tomorrow.
But fiat currencies were designed to be inflationary which makes them shitty store of value. There is no point in saving in fiat today when it’s value will be lower tomorrow.
You want people to hold real assets, not imaginary ones like a currency, because you want people to be invested in your economy. The only intrinsic value a currency have is taxation.