There is no change of context. Comment thread OP stated that vegetarianism is a luxury of modern times, something patently counterfactual. She specifically mentions supply chain issues such as the local availability of produce and economic concerns over the cost of meat vs. vegetables. We have been talking about supply, demand, and economic feasibility this whole time.
There is no world in which a person's daily intake of protein is cheaper to produce in meat than in grains and legumes. That it is cheaper to purchase is what OP is commenting on and I am decrying as unsustainable.