That's overly reductive. I was hoping that the specific commodities weren't going to be the focus, but I guess that was naive.
If you're going to use "housing" as an umbrella for its substitutes, let me do the same. Instead of wheat, beef, pork, cocoa, sugar, etc, let's call that "food". So now food is as essential as housing. Why doesn't the housing complaint against speculators work for food speculators?