The reason Soviets haven't suffered this same fate has to do with how Soviets have never been in a good spot. They, like the later factions, have had to rely on some hefty cheese tactics. For years it was maxim spam, which actually was the one scenario ostheer could handle, due to both sides using team weapons, and probably more than anything grenadier rifle nades. Plus pio flamethrowers.
But soviet always relied on their commander callins for guards for the longest time. So when penals were forced into being the One True Way to play soviets, it was largely because of the soviet v okw matchup. They were made to be versatile and strong enough that soviets wouldn't always go t2. But then maxim was obliterated after the penals were changed.
So you get penals with new bells and whistles, like ptrs, at satchels, and to the last man.
Ostheer on the other hand got... Nothing really, despite lategame wehrmacht infantry scaling being one of the original charges for the balance team.
3/5 Con strats was a thing but mostly on the first 1/2 years.
Maxim spam was mostly an anti OKW strat although some also used it against OH.
Somewhere there before they removed sprint, double snipers.
Cpt molo double clowncar opening.
OH could always handle SU, specially after holding the T70. After buffing Penals, they were basically Rifleman flamers, a situation which OH couldn't handle but opposed to USF, they didn't had zooks, cpt or a Stuart. What they did had was a strong call in in the Guards. T70, Guard and Maxim nerf later, you end up with Penals been the only unit with the "old" power level.
OH relied on the same clutch thing as SU, but people don't consider it "cheesy". G43/Osstruppen/Sniper/FHT (against 1 dimensional no AT strats)/222 (old one due to cost)/Stug E (old)/Stug G/TWP/Tiger/CAS. Somewhere there you had Puma/Command tank which was basically a response to light vehicle meta.
OH never got changes which basically alter the basic style of play besides very few instances (Pio spam). Saying they never got "anything" is kinda misleading. Double HP +2 on the sniper made it from a glasscannon into an oppressive unit. The only other "Penal" type of change they got was with the buff and ninja change on 222 cost which although "OP", it was overshadowed by other things still (also bugged MGs). Brummbar, something you can't easily get on 1v1 but more so on teamgames, received a deserved buff. Then it was just slight buff like Pio changes.
@OP
Ostheer is basically a faction which doesn't rely on "cheese" or 1 dimensional strats, which for most people is way harder to pull off.
While strong, 4 man squad (gren/mg42/mortar) and sniper are way harder to micro than just moving around with Volks. Same with 222/FHT vs P2.
The thing is, it's easier to be punished as OH, as opposed to OKW. The amount of effort/micro you need to put into each faction is "abysmal". I'll say that OH+ any number of OKW is more versatile but for anyone who is not top200 i'll say they will have an easier life by just playing OKW on teamgames.