The biggest issue is that Ostheer in a 1 v 1 USAF have a 1 squad base infranty delay which really causes every 1 v 1 against usaf to be nerve wrecking. while playing as USAF you really have the upper hand in numbers.
This wouldn't be quite as bad if Wehrmacht buildings and battle phases didn't suck up your manpower so not only is your first rifle infantry unit delayed, you just can't hope to build as many of units as your opponent for a fair while.
Unfortunately, they do. And the USF Lieutenant compounds the issue with providing them an additional good combat unit if they build their tier 1.
A faster-building T1 Wehrmacht would help with it too, but I'd think the manpower costs of the buildings and tiers are a much more insurmountable issue - it is far more reasonable to deal with arriving to the field seconds later than being outnumbered.