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Considering how long humans where out in the galaxy during the golden age of technology, would it not be conceivable that the STC databases used in the initial colonizations be somewhat different than STCs used in later colonies. The version 1.0 only being able to produce template for very basic versions of rhinos and russes and STC Prime v45.2 being able to build, say, a uber obital defence russ
Also local needs would likely have dictated what manufacturing infrastucture was built. What we see in the imperium today is most likely the most commonly manufactured items of the day.

The galaxy is pretty big and i think its possible to fit a large number of wildly different toys for the imperium with out betraying the (machine) spirit of the fluff. Even it contradicts certain specific details

For myself i wouldn't mind some 'hand me downs' to get us by until they can supply us with something new. As stated above the Macrocarid is basicaly a souped up land raider