A reserve currency is not based upon your ability to inflate it away. That’s exactly what got us into this mess. China and much of the world wants something more stable. They don’t wanna store their wealth in dollars and watch it’s value erode away by inflation which we used paper massive military and welfare programs.
China's spending is even more out of control than ours: they just hide it better by laundering it through multiple banks and CCP owned firms and use their trade surpluses to subsidize the domestic economy.