But when you say their own currency, if you mean fiat you have all the same limitations as the traditional system we're trying to get away from and if you mean shitcoins, it's enriching some insiders somewhere and it's not a neutral protocol of value like bitcoin. It can be displayed as fiat' to the end users for easy calculation and recognizability but bitcoin under the hood to keep the openness and permissionless-ness. Think that's a healthy compromise but just my opinion
