But it's a lesson in the same category as "You'd better learn how to do equations on paper and long form because you won't always have a calculator with you." If the underpinning is obvious bunk, it does nothing to reinforce the desired behavior and can in fact be counterproductive.

The reason to do long form math on paper is to get a feeling for the mechanics of math so that you can extrapolate it to more complicated math. The reason to save is that there are minimum barriers to cost for investiture in capital, and capital pays dividends and grows in a way consumables don't (unless it doesn't! Nobody wins in a civil war).