So bassicly you will have to hold off without armor for a long time. It can be diffecult to handle the pressure that is coming towards you but with the right positioning you should always be able to handle it.
Langres is one (if not the only) of those maps where this can work. And tbh it's the ostheer playstyle more or less - being on the backfoot because you can't compete with riflemen in the early game. That usually snowballs into struggling with light vehicles (stuart mostly). Then the pack howi starts to bleed your MP by sniping and wiping your MGs and mortars like hell. Now that the veterancy doesn't work for infantry, USF has the infantry advantage throughout the game. And most likely the snowballing advantage too.
Some other maps though, like Kholodny ferma (especially west side) and Semoskiy where there's a lot of sight / shot blockers and basically every house in the map is against you and you have a really hard time holding even 1 VP and adequate fuel to get vehicles out early enough. The same reason MGs aren't very effective, or PaKs. There are some decent maps too like Faymonville and Arnhem. Minsk is awful in 1v1, it's too big.
On Langres you have the visibility for PaKs and MGs which is absolutely crucial. And visibility for grens too since they suck at close quarters combat. In short, this is why it's the best map for Ost. I feel like most of the 1v1 automatch maps more or less negate how Ostheer was designed to play. You are forced to go sniper aginst USF/UKF to have any chance, since with grens you can't bleed his MP - you will just bleed yourself. The sniper play however is even more micro taxing on top of the ordinary constant repositioning your MG(s), PaKs and grens. Mortars used to be pretty good for Ostheer, but now the mortar pits of the UKF and pack howis bleed them to death.
Usually you end up getting an emergency Puma or command tank because you can't afford to tech after the early game struggle. Then you try to hold on with your combined arms until some stronger T4 stuff (panther/werfer) for example.
Just my take on things, wish I could become good at Ostheer (or at the game in general) one day