Nobody is using currency as currency though, everyone is using currency as a store of value though, absolutely every single person is doing that and every single currency out there is merely a store of value.
Yes it would be better if we could trade one commodity for another without a middle man and their fees, but a measure of value will never be anything other than an abstraction like an ounce, or a degree, once it's tangible, either in the real world or the digital world, it's no longer an abstraction, or an idea, but an actual thing that can be exchanged/transferred and therefore it's like saying that the ounce or the degree can be exchanged/transferred when in fact it's only an abstraction, an idea which represents something abstract, which can be "created" freely, and without limit, or it couldn't be used as a system of measurement.