Great article. I never understand why "financial advisors", when making pitches for consumer frugality, invent a wildly optimistic interest rate (12%?!) and say things like "you could have had $X million dollars, IF ONLY. Well, sure... you could have. Or you could have had no dollars, and also no coffee, since return rates from the type of investments that have any chance of making 12% are anything but guaranteed.
https://en.wikipedia.org/wiki/S%26P_500_Index#Annual_returns > Total Annual Return Including Dividends 10.53% > 25 Year Annualized Return 11.93%
Overall, the long-term trend may be pretty reliably positive. But that's little comfort to an individual who may not have the luxury of waiting out a poorly-timed, lengthy downturn.