That's certainly true, mate. Cryptocurrencies like Bitcoin and Ethereum cannot be used for everything, as not everyone accepts them as a medium of exchange. For most people, Fiat is the currency of choice for day-to-day payments because it's backed by the government (not to mention that it's stable in price). Thousands of merchants and businesses around the world accept Fiat, while that's not the case with crypto today. However, there are cases where crypto is necessary when you want to achieve true sovereignty over your money. If you're worried about governments confiscating your assets, banks freezing your accounts, or any other undesired events, crypto is the way to go. Depending on the scenario or situation you're dealing with, will be the currency to use for payments in the mainstream world.

Neither Fiat is better than crypto or vice versa. Comparing them, is comparing Apples vs Oranges. After all, volatile prices of crypto prevents anyone from using it as a currency for day-to-day transactions. It's more like a long-term investment than anything else. That is until prices become stable and crypto becomes scalable for the whole world to use. Once that happens, people will use crypto as they would with ordinary Fiat. Despite this, I believe that both ends (crypto and Fiat) will co-exist alongside each other for many years to come. The same way people still use precious metals like Gold and Silver as alternatives to Fiat, the same will apply to crypto. After all, this is part of the worldwide economy. Just my thoughts