Technology

It is way cheaper. two assembly lines to assmebly 2 packs, separate work orders, specific assembly per model ordered ( so customet doesn't pay for low end amd accidentally get highend or vice versa ), CAD and data management of two variations. It is why ModelT only came in black, is streamlines the whole process. You see much simpler examples in other induatries ie. that use stock material. it is cheaper to stock say 3 foot precut lengths and if product only needs 2 feet you chop it off at assembly and throw away the 1 foot scrap, rather than stocking and inventorying 2 foot and 3 foot stocks. Unless you invest in an expensive atock feeder that cuts the stock to length typed in, but that machine isn't mobile so neesa to be placed at the exact location of assembly. And if you need it two places you need two stock machines, so then you start weighing the crude method vs precise