Fiat money is an alternative 
Please show me how you transfer $ fiat from 3rd world country to your client or vendor in Europe or US within 3 -8 seconds with barely to no fees?
It depends on which 3rd world country you live in, if a coin with very low fee and instant transaction is listed on a local exchange, you can buy it with $ and send it to europe or us. As it is local exchange you probably deposit your money with no fee through your bank account?
Well, bank (if allows you) would take few days using Swift and will cost you a solid amount of fees in most cases. Using Western Union? Massive fees.
Crypto? If it's the right one, takes few seconds to wire anywhere in the world and fees are barely to none.
Can we agree ?