True, but that's due to the fact that they can set up huge factory-complexes that can produce the items in question on an assembly line, along with various feeder-industries that can provide the necessary raw materials, processed resources, parts, etc.
We don't have any of that, though, since we're a post-apocalyptic society. Unless
@CubicAppalac makes the Wasteland Workshop DLC and its capabilities canon, production will come either in the form of scavenging (like picking up all those army helmets various military skeletons around the Commonwealth still wear), or local craftsmen producing items using similarly-local materials using basic tools and maybe the occasional bit of machinery.
That severely limits the benefits - and even the possibility - of standardization, at least until the Commonwealth is a lot more pacified and organized.