Greetings!
As I peruse my rulebook, board, and pieces, I note that factories can be built and sometimes have been built prior to the start of a scenario.
Just a few thoughts: No factories are set up to begin with or did I miss something? The Axis and Allies game family has factories to begin with. The Xeno game family has factories to begin with. Jeff Stein's WW2: The Wargame has large and small factories both to begin with and to build. (Small factories cannot build battleships, carriers, and bombers. Large factories can build anything in Jeff's game.)
Was it planned that way for simplicity or ease of game play or what?
What about a similar addition to WW2: The Struggle . . . ? --like small factories in Hungary, Czech-land, or Romania? Just a thought.