Actually rolling economy first is not always good.
-As Germany, Innovation is more important for getting Late Fighter-Industry.
-As Austria, you can rush to Russia or Italy with researching offense first,
-As Turkey there are huge benefits getting bunker tech or late fighter immiadetaly.
-As UK naval techs can cause serious troubles for Germany to keep its navy.
Also I agree that there are only 2 really weak techs which are mobile warfare and merchant marine.