A historically balanced game with a plausible degree of variation is what I think they shoot for, and should. Or else set it in an alternate universe.
Although plausibility is restrictive, since much of history is very implausible. The Napoloenic Wars, the Civil War, WW1, these are all stories with fairly solid drama.
WW2, though, is at an overly complicated and over-produced Hollywood blockbuster with a story line, too full of incredible plot twists, lucky breaks, and deus ex machina events to be believable, though it is a rollicking adventure story..
Think about it -starting with just the Pearl Harbor disaster, from the incredible bumble and laxness that allowed US forces to be caught out both at Pearl and in the Philippines, to the terribly convenient last-minute delay in delivering the Japanese Declaration of War that transforms the shock of a pacific nation instantly to righteous fury, the German declaration of war for no good reason, to the carriers being at sea , lucky to escape, that the Japanese turn away prematurely, and the battleships can mostly be raised - from the 1930s through ending with a secret superweapon, it's a twisty-turny adventure tale that has to make the audience's head spin trying to follow it.
Let's not forget the aviation error, French strategic errors and fortuitous meetings in Germany that explain how the Germans changed their plan and basically just punched a hole and overran an army with a high reputation that had been preparing for this assault for many years.