Earlier quoted context omitted.
I can think of at least two real-world uses where cryptocurrency is a better choice than fiat: (1) sending money overseas with very low transaction fee, and (2) transacting on the black market.
> sending money overseas with very low transaction fee Except that fluctuations in the conversion rate make this very touchy, especially if you're talking about a significant sum of money. Also, sending crypto anywhere outside of a handful of developed nations is fraught with difficulty because recipients need to be able to convert bitcoin into spendable money which often involves risky in-person meetups and gigantic…
Also, having options is better than not having them. Sure, there's the international wire system, but it wouldn't hurt to give it some competition.