The biggest advantage, from the government's perspective, is tighter control over the money supply and over transactions. A blockchain with a centralized author

The biggest advantage, from the government's perspective, is tighter control over the money supply and over transactions. A blockchain with a centralized authority is able to do unique things like forcibly remove money from someone's address and freeze an address from sending/receiving, all near-instantly. Hard to track and freeze money when it's a bag of cash in a criminal organization's possession.