and then sales people make it possible to make money off of that thing...? I'm not seeing how engineering doesn't need sales just as much. It's as if the author just said:
>~ However, the reality is that farmers need well diggers more than well diggers need farmers. Well diggers come and go but farmers grow what matters.
No farmers: everybody starves. No well diggers: everybody dies of thirst. Acting like one is 'more essential' is the wrong distinction to make. (How about: cost to replace, return on investment, comparative advantage?)