The alternative is a static or deflationary currency. This leads to hoarding of assets which were originally intended to serve and increase commerce. Think Bitcoin. Without MMT, we would be falling from a skyscraper as you depict.
Someone owns every asset. By making it impractical to save using the fiat money, savings goes to non-fiat items like land, stocks, energy, and BTC. This harms the poor who are rarely able to escape into those non-money items.