^ Worth noting, that this is relatively modern history. It's usage stopped as a currency in the mid 20th century. At the beginning of the 20th century, some african countries still accepted it as taxes
I'm no crypto-anarchist, but plenty of currencies do not meet this definition, and have failed as a result. Indeed, it's a time honored method of spurring growth to simply create money, and it's a time tested cause of instability. Certainly a well managed central bank is an asset, but it's hardly a reliable method of keeping currencies useful. There are plenty of reasons to be concerned with bitcoin's deflationary nature, but arguing that it's not as inflationary as government backed currencies is an argument that can damage both side of this debate.
Cryptocurrencies can have all that, but they need to have a high transaction volume (tens of thousands / second), regulation, protected / monitored exchange value, etc. Which defeats the original purpose of an "open source", unregulated currency.
But you get what you ask for.