It's understandable to say that such a thing would go against the faction's "design" as 100% fuel income and the ability to build fuel caches would for OKW.
Honestly though, what can they add down the line to these factions that remains within the boundaries of their initial design goals? They are going to add things that give variety to a faction, otherwise the faction gameplay would just become stale.
Who wants to be stuck in the same strategy of massing riflemen, then building Shermans and Jacksons? Sure it's versatile, sure it's mobile, but it get's boring and repetitive. They will eventually need something to give US players different strategies to pursue.
As was stated, the US does have great AT capabilities, but a good chunk of it (namely the riflemen with AT grenades) can be negated with things like MG's and indirect fire. Not to mention that the German heavies can pound infantry squads into nothing with ease. Just because the US has a good, mobile AT platform, doesn't mean adding a Pershing is going to make them unbeatable. Their AT is only as strong as their opponents allow it to be. The addition of a Pershing will grant some longevity to their frontline.
Thats the biggest desing problem with the US imo. You cant do anything else than building Rifles and (maybe) calling in doctrinal assault engies. Or doctrinal cars. But essentially their only option is Rifles. Lategame is reactionary and consists of equiping your Rifles with weapons and getting Jacksons and the occasional Sherman. Thats all. Every single game. May be versatile, but it makes the US a versatile one trick pony faction. Whereas with the Soviets, you have way more options, for example to start the game. To alter your build. To do something different than mainline core infantry spam. You cant really do that with US without doctrines. You are getting funneled into a single late game tier too. You get the same units every game, except for the occasional Lieutenant or Captain decision. And because everyone knows what you will be having, people can freely and safely adapt before the game and the first engagement even starts. Great design.
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