"That printing money thing" has doubled the dollar supply in under a year. "That printing money thing" is embedded in the legislature of the largest central bank in the world, and has influenced all others of consequence.
I understand that you're trying to eliminate the bond and exchange markets, but the problem is, their backbone is the fundamental structure for how any system could ever work involving money as a medium of exchange or as a store of value. You need a money market for any currency system to exist anywhere. If you decide to remove one, and pretend we're hairy cavemen, everyone can always assume every dollar everywhere has an inefficient market value.
Incapable of engaging with the labor market, goods market, or any market at all.
That would be a problem, I'd say.