WHY IS THAT SUCH A GAME BREAKING NOTION, to have a reliable AT for Ost when it is most needed?
Why would that be hmm, oh I know, because allies RELY on early vehicles with short opportunity windows and having hardcounter for them from get go isn't a good idea, especially when allies need to dedicate a whole tier or doctrine just for that early vehicle.
Why should it be hardcountered by default? You have mines, you have faust, everything needed to deter it.
You're not dealing with a 3 min light tank here, but a fragile scout cars who die to small arms in green cover.
You don't need any early AT for that, you're NOT in the situation of USF where you have no vehicle snare from get go, no mines and need to make a tech choice to even have a shitty AT gun.
Grens soft counter lights, HMG42 recent pen buffs softcounter lights, that is all you need before T2 and PaK.