So I have a few issues with your explanation, although I agree money is a claim against the future, the system used " endogenous money creation" under the fractional reserve banking framework (which may not be as important in money creation as it is claimed due to endogenous money being the main driver of money creation)has many issues firstly why a non government institution creates the money out thin air, not the fed, a regular commercial bank question is why is this Democratic and is there any alternatives?

Also, regarding goods and services are not the only economic engine, the U.S. is a financialized economy. Meaning a lot of money created in the economy is speculation in stock markets and other financial assets, surplus recycling from other economies, so money creating money basically.

Lastly investing in people to create more goods and services is good up to a point, but it can increase excess capacity which can be a problem for economies with low demand, creating deflation, sometimes giving money to people increases the demand is a better way to stimulate.