Comparative advantage explains how to make use of inefficient agents, so that ignoring them is a worse option. But if you can convert them into something else, you are no longer comparing the gain from trading with them to indifference of ignoring them, you are comparing the gain from trading with them to the gain from converting them. And if they can be cheaply converted into something much more efficient than they are, converting them is the winning move. This is a move largely not available to the present society, hence its absence is a reasonable assumption for now but one that breaks when you consider indifferent smart AGI.
Comparative advantage explains how to make use of inefficient agents, so that ignoring them is a worse option. But if you can convert them into something else, you are no longer comparing the gain from trading with them to indifference of ignoring them, you are comparing the gain from trading with them to the gain from converting them. And if they can be cheaply converted into something much more efficient than they are, converting them is the winning move. This is a move largely not available to the present society, hence its absence is a reasonable assumption for now but one that breaks when you consider indifferent smart AGI.