I don’t think greater national unity for democracies makes a lot of historical sense: France didn’t have more of it than the Soviet Union. And there’s the example of Finland allying itself with Germany to invade the Soviet Union and get its lost territory back.
Civilian industry and research are still the two areas where I think it makes the most sense to give democracies an advantage, but another could be the ability to change leaders peacefully. Britain of course did this at the start of the war, and Finland did too when they needed to get out of it. But there was no way for Italy to get rid of Mussolini without killing him.
They actually got rid of him without killing. Then Hitler forced him to restore fascist regime