I have no idea whether or not this is the case, but it is possible that the stock modelers were not very well-versed with Star Trek before they were given the task of making the models, and therefore may not have had such descriminating eyes that we all have for ship models. This, in addition to time constraints, file size constraints, and performance constraints, makes it very difficult to produce models that live up to the high standards that we, as fans, desire. To my knowledge, none of us here follow such tight constraints that the stock modelers followed, so we have much greater freedom to produce models that meet our expectations.