What is the Value of Collateralized Commodity Future Strategy

Understand you are long a commodity future contract and a government bond equal to that value. What is the purpose?!

I believe it’s so that you can limit your downside risk, like have a fidicuary call

Seems very simplistic. Just hold a government security? Not much to it.

I know some commodities funds invest Notional Value x maintenance margin in commodities and place the rest in TIPS for inflation protection.