I think the parent is talking about an ideal situation in which saving accounts do actually pay off a nice interest that beats the inflation and sprinkle some extra profit on top. Not a lot but it is risk free. Isn’t the idea that banks make the money flow by circulating it around a good one? A saver who doesn’t need it now can park it in a bank and when their time to retire comes they get their actualized money plus some profit. And since the interest compounds, with a nice rate it could be both safe and profitable.

I agree that this is not feasible now but that is only becaus of the low interest. That dynamic would change if the interest is dialed up.