I don’t understand how you reached that conclusion. MMT unlike a lot of other perspectives on money acknowledge how money is all fiction and what matters is actually what you produce.

The core tenant of MMT is that you are restricted by your resources, ability to employ more people and capital, not by money.

If your resources are underutilized then printing money to utilize your those resources is free. Classic economics will allow massive sections of the economy to remain unused, wasting enormous resources only to wait for prices to stabilize.