Well yes, of course you're going to get a couple riflemen at the no matter what faction, but in CoH1, if you wanted to, you could get snipers, MGs, mortars immediately after the riflemen and use them to support them (barracks and support weapons center both costed 15 fuel).
In CoH2, it takes at least a couple minutes until you start teching and nobody uses MGs because lieutenant is garbage.
And USF is so predictable, you can't start with anything else besides riflemen, everybody goes captain for AT, because lieutenant only has early game units (AA halftrack is too expensive at 70 fuel). MGs should really be in the HQ.
Unless if you decide to build 4ES, then American play was all about the rifles (and a sniper because VCoH).
You caaaaaaaan argue that US play in VCoH is predictable, but due to how the riflemen were, how they got vet and how strong the Wehr defence was, it was, at the same time, exciting.
And the VCoH 30 cal was a lot worse than the CoH2 one so its all the same really. In 1v1s, barely anyone built mortars unless if there was a mortar on mortar battle.
I mean, of course, if you end up blobbing up rifles, esp earlygame and esp considering they're not the glass cannon units they were in VCoH, the US play is going to be really predictable and no fun, if you flank though like in VCoH, who needs smoke?
The one thing I'd add for the US is non-doctrinal Artillery and proper mines, that would be something the USF really needs but don't get because reasons.