Nice observations. I'm hoping standard Grenades is more of a thing with OKW. OH's weakness is they have no normal Grenade, it's a shame.
I cant tell if its infiltration tactics from the doctrine. I hope it isnt. Also, OKW have another big disadvantage: Ost have the super useful panzerfaust for stopping every tank dead in its tracks. OKW have to man up and kill them on... well not equal footing, but OKW has to kill other tanks when they are allowed to go full speed.
OKW cannot really disadvantage the enemy. Also, at the end of the stream, the AI made the the special OKW version of the pak, but they did not focus on it, nor did it see much action as they had few VP's left.
I wonder how much the Infantry Support Gun costs. Its pretty inacurrate at range,so it is probably better in twos.
The Kubelwagen looks soft, but they cost the same as an Ost mg - imagine just having 3 of these constantly suppressing blobs at all angles, backing up and avoiding AT nades. With 3, the Americans cant smoke all of them.
And then you can come in with Sturmpioneers and eat them alive. I dont know how well it stands against a maxim, and you could pressure the soviets to make an early AT gun - one which is more useful in your hands.
There is just one problem... the m3 scout car. OKW has to assault it, or it will kick OKW ass. Its main gun will shred the kubelwagen, and its front armor is pretty resistant to its mg, i believe. With no panzerfaust... i dont know. I really dont know how OKW can take it on. They will have to use a halftrack as a shield, and possibly storm it with sturmpioneers.