Earlier quoted context omitted.
As a childhood lesson you don't need crazy inflation for this to hold true though. Anything that takes more than a few of months to save up to just doesn't make sense as a kid. Your disposable income goes up by factors of ten every few years. You have 2$ to spend at 5, 20$ at 10, 200$ at 15. Then it slows down but you might still get to 2000$ at 25. Saving as a kid really never seemed worth it to me.
It's about the lesson more than anything else. I really want my kids to learn how to save and be well practiced at it, even though the utility function doesn't make a ton of sense.
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).