All money may be “fiat money,” but would you rather hold the currency issued by a supercomputer sitting somewhere you don’t even know, or the currency issued by a global superpower with a dozen aircraft carriers and thousands of ICBMs?
What’s the difference? The vast majority of the “dollars” I hold are electronic and have never been anything but. The fed electronically gave some bank money which eventually got to my employer’s bank’s computer, and then went to my bank’s computer. It’s all just 1s and 0s at this point. Sure I got about $100 cash in my wallet, but that’s just mad money. My “real” money ain’t real.