Western Allied doctrine in 1944 was absolutely to carpet the enemy in as much high explosive as possible, to reduce infantry casualties.
If you want to redefine Combined Arms so that it doesn't include artillery, go right ahead, but you'll find it difficult to have a 20th century historical wargame that suits your inclinations. Particularly one set in Operation Overlord, which even by WW2 standards was a massive triumph of firepower.
Personally I'm looking forward to drawing up some nice big fireplans using the sophisticated artillery tools in the game :-)
@Speedy - "as soon as the spotting rounds come in your troops run away" - yes, fair enough - but does running away help them achieve their objective? ;-)