> Cash is a decentralized payment system for most intents. So the question becomes: Do I need a digital decentralized payment system? Does one need them?
Cash is not decentralized. Governments can print as much as they want.
It's decentralized for most purposes. It would be very hard for the gov't to revoke any transaction, or to blacklist money you have (except in very specific cases where the stars align and they can list serial numbers to block).
The fact that gov't can print money has roughly the same effect as speculation has on cryptocurrencies
Cash is not decentralized. Governments can print as much as they want.