1.Crypto currency is more secure and faster transactions than fiat money via long distance and transactions like sending money around the world crypto is fast, safe and more secure then fiat money in this case fiat money is not good and slow in long distance transactions.
2.Fiat money is more faster and more easier in hand to hanp, face to face transactions and offline transactions in this setuation crypto currency is not good.
I strongly agree with this, there is no reason to fight or kill fiat currency because we can use it on our everyday personal transactions like buying things in the market, paying your debts personally to your friend and so on, it is a perfect combination in the future.