You guys are pretty quick to call this a strictly l2p issue but I think the problem is rooted much deeper than that. I have been experiencing the same issues as the OP in 2v2s as Axis recently.
Early game will be pretty fine with MGs/Kubel supporting Grens/Volks allowing us to at least hold our side of the map. Light vehicles come and can be annoying but are generally counter-able, but once the 120s/pack howis/scotts and other indirect fire units get rolling the game just goes downhill fast. I've actually lost 6 vet 3 LMG gren squads to complete 1-shots in a single game. That's just ridiculous and game-breaking.
Anyways, I don't have a ton of time at the moment to go into it but Ostheer 4 man squads have been a problem since the beginning of CoH 2, they've always been prone to being 1-shot and there have been threads about it before, this isn't anything new really. The problem has just been exacerbated by the new squad cover behavior - which is cool in general. I just wish there was a way to toggle your squad to spread out, for when you know they have indirect fire raining down on you. I mean... even AoE 2 had this option like 15 years ago...
I did come to pretty much same conclusion.
Maybe my 1v1 play isn't at the top level but I find OKW to struggle against indirect fire.
That being said however I don't think we should nerf these type units only because OKW has hard time dealing with them. I'd be incline towards different approach.