Yes, just like you can't eat trucks, roads, grocery stores, tractors, combines, crop dusters, grain silos, mills, or the FDA. Any system needs many components, most of which aren't directly consumed by someone.
My comment conveyed the meaning that you aren't adequately interpreting the point of GP.
To ask "What point?" Is disingenuous, since the point was laid out pretty clearly in the lineage of comments you were responding to.
I don't/can't know why you are struggling to grasp the point. It may be because you don't want to, or it may be because you are missing some other knowledge or perspective - the only way to sus that out is for you to engage with genuine curiosity. That's outside my control. I can confirm as an external party that you are missing the point of the GP, but I can't force you to want to understand it.
You bothered to write 3 paragraphs close to the original comment length 100% being a personal attack, and failed to articulate the point in context of my comment, let alone explain how the original comment answers the eat bit.