ostheer has np isg or mini howitzer 100% accuracy barage, usf has no sniper, soviets has no panther, brits has no pgrens stpio...
Let okw have disadventages like other factions have.
Personally I see no caches as a huge disadvantage already, besides suppression is one of the key components of what sets COH2 apart from so many other strategy games. I think that asymmetrical balance is an awesome idea, but there are aspects of the game which all factions need ex: (indirect fire, mines, AT etc..). Suppression is definitely one of them.