As a better way of explicating how the central government/central bank economic Leviathan functions, I think MMT is excellent. I do also reject it, though, as a prescriptive economic paradigm. It still has that Leviathan 'managing' the economy.

I do, however, know of another theoretical "money tree" that I thought you might find interesting. (I 'grew' it myself.) With it, the supply of money (as currency) is self-regulating, making the economy as a system self-regulating. The supply of money (as currency) is free — is created as needed — but its size is limited by — determined by — demographics, so there are built-in safeguards against inflation.[I refer to "the supply of money (as currency)" because the creation of money in the form of fractional reserve banking would continue as at present; each would be a separate and independent contribution to the total money supply, but the former would ultimately govern that latter.]