Since when does USF have Katyusha rockets?
only you could care so much for a single faction. Sadly i got bad news for you... there are 5 whole different factions in the game, including USF. Play with all of them, that might teach you a valuable lesson and give you a good perspective about balance.
I don't really want to be a part of this back-and-forth, but I should say that Panzershrek PzGrens are a pretty common sight with players rushing T3.
Pgren with shreks also have face 2 or 3 riflemen squads, probably vet2 by the time frame you mention. Rushing T3 is risky if the allied player is offensive with infantry instead of LVs.
But i admit pgren are the new penals, but for axis