I think Fiat currencies is what we really need because It helps to run this world. Othewise, if we use digital currency as an official currency, the government can not control digital currency, I think it could harm to the economy system in someway
I do not agree with you because when the governments regularize crypto they will hold the transactions and will keep a record of all transactions from their country. But till date fiat currency is essential for the economy and cryptocurrency will take long time to take place of fiat currency. The economy will be better with the use of cryptocurrency.