>Unless you want savings limits and expiry dates on your money.
I don't believe in saving limits or expiry dates in the sense of losing 100% of your money. But think about what impact limiting savings has on debt. In aggregate, there can only be as much debt as there are savings. This means if you want to limit debt in the economy, you are going to have to limit savings as well.
This is particularly relevant with debt brakes. A country with a debt brake but without a savings brake is going to run into a pretty fundamental limitation.
Savers can delay their spending decisions and this ultimately delays the ability to repay debts but since debtor's are at the mercy of lenders, we blame the debtor for the lenders tardiness.