Fiat is being used to enslave you. So it is 100% not necessary at all to have fiat. People can use a resource like silver or gold which evens the playing field. We don't need the central bankers controlling our economies and running us into the ground so they can live large and have it all. In the USA we pay 6% to the bankers to print our money. WTF..
Yes, this is the way things are in the world. But I don't see how we can exist without fiat today. People had already been using gold and silver as money for a few millenia, and in the end it caused an incessant sequence of economic crises which ultimately ended in the world war (1914). Anyway, I don't think that you would want to get sent back in time like in the 11th century, with no fiat around and nothing else as well which makes your life so comfortable and cushy today. So be cautious of your desires as you don't know what you're bringing into fruition.