Fun Fact: you need t1 to unlock faust on Oustruppen so skipping t1 isn't a good idea when going Oustruppen
You only need those if the enemy gets scout cars, and that costs the opponent 160mp to unlock in the first place.
With the added 80mp to the Ost starting manpower, and with the delayed need for T1 (another 80mp), the Ost can get a really good start with Prostruppen and MG42s.