it would be so much easier and faster if the ATM just printed the money right then and there

ERROR: Insufficient YELLOW ink. Withdrawal cancelled. Alert attendant and try again later.

Could have a little incinerator as well for your deposits

Easier? Probably. Faster? Debatably. Easier for people to print fakes? Absolutely.

I’m sure the output of a few thousand ATMs is a drop in the bucket compared to the money we printed to fund the war (1 billion per day)