Fiat money and bitcoin are two different components, but due to the fact that bitcoin is separated from the state - this is 100%, I would even say that cryptocurrency cannot be controlled and the more it develops, the more I need to control it ... Fiat is needed in its own way, bitcoin is needed in its own way, the state of bitcoin is currently beneficial to all parties.
in our time now, there is no need comparing fiat or bitcoin because they are both functional towards our needing.
there are option to use bitcoin there is also a option to use fiat.
company offers accepting bitcoin while others are not.
Imo BTC is better than fiat in that case that you can easily send it form US to Russia. From Brazil to Canada. It's multicultural. And some other things but this is my favourite.
You are partially right because which country Bitcoin allowing it's banking systems, where you can easily send Bitcoin with any fees or transactions fees. You can easily send Bitcoin and others cryptocurrencies making no locals coins exchange or others third parties institutions.
but there are limited countries that allows this so yeah it is our option when to use or how to use our crypto and fiat.