In spite of the words mentioned in the article, I consider that stable are not important to the speculators or me.
stablecoins are companies or individuals that want to buy a token/crypto with the guarantee that you will get $ 1 "or any amount" when you want to sell.
So we came back to the central system with a new concept that individuals or companies can create money "We must trust their promises" that is more dangerous than the current financial system.
Also, some decentralized systems "which I think" it is better but still risky.
Its my impression of those currencies.
I am not disagreeing with you but taking into account how long can take to move your crypto to fiat and then to crypto again I suppose that stable coins do give a service to those that really need it and are high volume traders but as say the problem is in the centralization of such services, if at some point it is proven there are not enough dollars or whatever the stable coin is trying to stabilize then the value of the coin will drop to zero since it is not performing its function.