Not really.
Think of it like setting a little aside every year to purchase a new vehicle instead of waiting till you need one and then financing the whole thing.
With the CRF you are paying ahead and earning interest (but usually losing to inflation), with a bond you are borrowing then repaying with devalued dollars.
Usually enough CRF gets used with the bonding to make the payment seem much lower.
Just various groups have realized that the CRF is a lower voting threshold than the bonding; so it has become much more popular.
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