Those factions are not based around an invisible/house fortifying AT gun, which (if played correctly) can take out every medium armour simply by having a double Püppchen move to the correct position.
How about the Puma which can consistently penetrate mediums as an early game vehicle, as "one who outrange them all" with TD range?
The raketen is funny, it lacks range to be a proper ATG while having the cloak to mimic the Ost ambush camouflage, which is good, even OP when you mass them, but mediocre when used individually.
This thing can barely catch up even with engine-damaged tanks at max range. They were kinda fine before with the veterancy range buff, now they're just weird. If used offensively, the raketen must put itself in harm's way, more than other ATGs, while the result is just so-so. If used defensively, it rocks, but only in numbers, and that's 540 MP or more.
The puma is what OKW needs, a fast response to Allies armor threats. But it doesn't penetrate medium tanks often at max range, and building it means you have no P4s and/or obers to deal with infantry for a while. So the Allies still have infantry superiority unless you build a luchs, which is nerfed into oblivion.