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.
This 2 reasons why crypto currency and fiat money will be a powerfull combination in the future.
Crypto currency is not that secure, i mean there are still many hackers and phising link out there and we, as a crypto users must careful and alert before sending your coins. I kinda agree with faster transaction, and also the fee is also really low. It's good for sending money from different place or even different country.