a big thing for Normandy and ALL campaigns would be a rework in the campaign leveling system for example, the axis have the Sturm-pistol for too long, it does absolutely nothing at long range, sure it can kill a jumbo but it you need to be close range and aim pacifically.
the tiger with can be countered with the T-34 85 DT (yes the DT as me and my friends have found out it is the one that has ‘historically’ an IS gun) all the tank needs is a little bit or luck and skill and of course, to fire first.
as of the server for noobs say like the Ground arcade in war thunder, it should give less XP for battles just enough to unlock the assaulter squad, and it should kick them out once they either get all their base specialists or once they unlock the grenade pack.