Whilst I regard sturmpios as balanced okay, I feel Americans at this point to my mind just aren't that interesting. With Soviets I have a about 4 seperate builds I can go with multiple small changes in either of the builds. With the US all I'm see are rifles... rifles and more rifles... It's not particularly exciting and especially considering that my skill with rifles isn't that great and for me they just aren't enough to achieve anything meaningful against OKW or OH.
The flexibility of USF openings doesn't come with different startring units, but different tactical options for your rifles.
Do you go rifles and fast tech into HMG/M20/AAHT?
Or do you stall for captain for light AT and either go stuart/PACK howie/AT gun if needed?
Or you just simply stall tech at all and go for nades or bars or zookas?
Do you go 3 rifles, or 2 rifles, additional RET and ambulance and make soft retreats back to it to keep concentrated field presence and pressure on cutoff while your 2nd RET caps the map and first does fighting position for rifle nade support.
Just because USF don't have a variety of units to open with, doesn't mean they don't have a variety of openings.
I myself played with most of what I've described above, it feels different, it plays different and its all about what works best for you. When AA halftruck "meta" for new factions calms down we'll see more builds.