To see MONEY consist of all 5 key aspects of what sound money constitutes,
Money is supposed to be
1.) recognizable,
2.) divisible,
3.) portable,
4.) fungible,
5.) And it needs to be scarce.
Fiat currency doesn't share many of these properties, one of which is scarcity. The value of Government-backed fiat currency can also be manipulated and corrupted. Right now, the Federal Reserve is printing more money in to the world Economy than ever before and it's killing the value of every dollar in your pocket and all other fiat currencies around the world as well.
Nice joke about What you mentioned about fiat currency. Fiat currency is better recognition. Also compared to bitcoin, the fiat (with help of internet and many payment gateways, payment banks ) has better portability. I'm not sure how bitcoin is fungible and fiat not. Would care to explain that part please?
Till this point we all are assuming that bitcoin supply is scarce. It cannot be produced more than that. What if developers changed that notion? After all its a software. When stakes are high anything can happen.