This highlights the problem-- the most "conservative" approach, a savings account, is actually TERRIBLE financial advice. First the money won't keep pace with inflation and second a bank failure will wipe out the fortune. That happened to savers in 2008, most notably the failure of IndyMac.
So- Your money not keeping pace with inflation is better than anyone profiled in the article managed.
Worst case scenario, bank failure, they might still be better off.
People fall into two broad traps.
Either they are loosing money for no good reason (a consumption culture with ever escalating healthcare/edu/housing prices makes this simple), or they are accumulating money for no good reason, thanks to some class they took that says beating inflation is the point of their story.
Once your housing/family healthcare/edu expenses are taken care off kiddos, there is no good reason to be beating inflation. Unless you are trying to build the Taj Mahal or something.
Actually there are some very straight forward wealth management schemes that may not get you the most return on your money but are better in nearly every metric than putting your cash in a bank savings account. The canonical example is a treasury ladder.
But you are correct that it can be doubled, tripled, quadrupled, or even greater by opening different account types such as a Retirement Account, a Joint Account, a Revocable Trust Account, etc., at the same bank since each account type seems to get separate treatment (according to the same FDIC link).