The only problem with that theory is Ostheer if far worse the USF in "mobile" and it can be even more annoying to play vs a USF defensive player.
Tje Pack howizter and MHT gives the edge to USF when it comes to static vs Ostheer when they already have the edge in mobile play.
As I was talking about teamgames the OKW mates are the more mobile part with strong early game while the allies of the USF player are most probably more static than the highly mobile USF player. This may be something completely different in 1vs1 which I don't play.
I hate static games that lead into artillery battles. They feel far less involving and intense. So I'm in for early breaking of turtle players and more dynamic game play with tanks + infantry where support weapons only have a supporting role (as their name suggests).