Put it all in Normandy or the Italian front and it would sell like hot cakes...
Western Front.. ya. It would sell vary well. or could.
Normandy OH GAWD NO.
Heres why....
Gravi games huge focus is on historical battles. In Normandy if you do a historical battle you end up with a incredibly lope sided force structure. There was zero chance after D day for the Germans to actually win. The amount of material available to the Western Allies stacked the deck so greatly that there was no way Germany had even the most remote chance to win. You really want something more close to the middle where either side can pull out a victory.....historically. After all, the whole point of waiting to 1944 for the invasion of France was to make it virtually impossible to get thrown back into the sea. In 1943 the Germans probably could have. Not enough of everything yet. By 1944 no way after the initial beach heads where secured.
North Africa or Italy offer the best bets for a historically balanced game. Normandy is more akin to playing as France in 1940. Interesting for sure, but who would want to play France?