Even if you 3D print a whole cathedral in concrete, printing something really detailed and the intricate takes more time than a straight line or simple curve, b

Even if you 3D print a whole cathedral in concrete, printing something really detailed and the intricate takes more time than a straight line or simple curve, because the print head needs to ac/decelerate. And time, even that of machines, is money. But much less than of humans, so the gap is smaller. Not sure about resin printing, but you can't resin print concrete (yet, AFAIK).