I listened. Stop assuming things. Try using it against Luchs because Luchs AT capabilities is terrible against AA USF. AA USF is great against even light vehicles when stationary.
I used it as and even against to know how well it is. Try it instead of being ignorant. Check stats even. Right there, in front of you. (USF)56:OKW)16 damage when stationary and when USF on the move does 16 damage while OKW zero.
Suppression is obvious since it suppresses well on the move. Even better when stationary. How do you not even realise that. All 3 guns apply suppression altogether making it better than OKW FHT.
You can counter the USF AA HT just fine with Luchs. You just need to know how because as soon as the USF AA HT moves it does nothing to the Luchs. And guess what, you can drive the Luchs around the USF AA HT. And guess what else the USF AA HT has very bad armor so the Luchs penetrates it just fine. Sure if you braindead park your Luchs infront of the rear of a stationary AA HT it´s gonna die but why would someone do that?
OKW AA HT deals considerably more damage to infantry after vet 2 than the USF AA HT because it has the accuracy to actually hit. You don´t understand the stats which is why you think the USF one is so much better. That being said there is a reason why most people don´t go for the AA HTs in current meta.