you ever seen how fast jacksons kill any german heavy tank with marked target and Airborne rocket planes?
Yes, ok, too bad jacksons die instantly to raketenwerfers, pak-40s, or panzershrecks.
And USF tanks aren't even an issue. Infact their tanks are really strong. It's just that in 2v2 double USF has completely no early game in 2v2 because of certain unit combinations that they cannot counter in any way. This mostly has to do with their combined arms options being very poor + their complete lack of indirect fire in the early game.
They could use a heavy, but that isin't the major issue.
Now, if the 0.50 cal was buffed and moved to T0, and a USF would get a mortar in LT tier, suddenly they would become alot more well rounded. Pak howi also needs buffs considering that the 240mp wehrmacht mortar is better than it and is 2 times cheaper
