For the record, I believe that one aspect that led to Crypto-currency's creation, was the belief that the "current banking system" was a "waste of resources", and they chose to "innovate them out of existance".
For sure though, I mean, sending thousands (millions) of diesel trucks around between bulding to building, hauling cash, and burning fossil fuels, is so much more efficient than a computer network and PCs running it. Right? It's not like the current banking system has no overhead, as far as resource usage, and it certainly has a LOT of downsides, when dealing with banks and whatnot.
Why not use a hassle-free electronic system, where citizens contract with citizens DIRECTLY, and cut out the (bloated, IMHO) middleman layer.
The internet allows us to communicate around-the-world, at the speed of light (nearly), for such a low price that consumer network connections are usually mostly "unlimited" (well, aside from Comcast)... why not do the same thing with our system of money, that the internet did to the postal and parcel services?
Or do you want to make the internet illegal, because it's a "waste of resources", and "we already had the postal system". Because that seems to be your position on this matter.