Money doesn’t work for governments the same way it does for people and households. Money is the “blood” of the economy. It needs to get introduced to the economy and it needs a way to be taken out of the economy (taxes, which also function as the “incentive” for even using the currency in the first place).

Governmental debt can’t all be lumped into one mass. Do you owe the debt in your own currency or another country’s currency? In the case of the former, it’s not really debt.

Forcing countries to trade in a currency it can print more/less of at a whim is a key part of how the US maintains global supremacy.