The question was basically "If you have a fixed pool of employees at fixed compensation-per-output (ie fixed net expenses) and a fixed product throughput with fixed values (ie fixed net revenue), why does it matter who makes what product since the net profit will be the same?"
Although it sounds like that question may have been borne out of my own misinterpretation of the post to which I was responding.
Problems with scaling production also are more complex than just labor cost, especially when starting up.