It's pretty rare for a single office to create, from start to finish, an entire product, like an engine or missile. The assembly line is distributed in the first place, with separate offices attaching, refitting, and validating different pieces of the entire weapon system.

So I do not believe this comment comes from a place of knowledge on this subject. My comment also asserts that factories are not static, just because they produce something now doesn't mean that they can't be assigned something later.