We're pretty much a "cashless society" now - I haven't had actual cash in my wallet for more than two years. This is all very convenient - and drives online sales and so forth. But the GIGANTIC problem is that we're now (though higher prices) paying those credit card companies at least a few percent of everything we earn.
For doing what? Moving some numbers around inside a computer. That's an egregious amount of the economy - for doing something that's ridiculously easy.
So it makes sense to have the issuer of "money" (the treasury) handle the shuffling of numbers as a non-profit...and have people only use credit cards when they ACTUALLY need credit.
So it makes sense to have the government (or the treasury) set up a system of digital currency that's not providing "credit" but is cheap (or perhaps even free) for use when you're only shuffling money around.
This would also eliminate the business of cryptocurrency mining - money could be created in just the same was that coins and banknotes are...without all of the egregious amounts of power consumption, etc.
Done with care and with serious attention to security - this could be a very good thing.