It is more or less my main critique; when I first read the changes my reaction was "WTF what's the point of EAD and playing as OKW if the meta is really just same as Ostheer?"
End of the day even with the small stat chances in armour, what you get is not so much an OKW version of Panzer4, but rather both Axis factions revolve around the same Panzer4 unit. Hence my suggestion that the characteristics of OKW's Panzer4, while remaining a medium tank, ought to come with a few differences, namely in abilities, like say having integral Emergency Repairs or Panzer Commander (though granted, seeing as how those doctrinal abilities themselves are rather limited, those are hardly the best ones to choose).
The OKW PIV has significantly different veterancy than the Ostheer PIV.
Panzer IV Ausf J. Medium Tank
Unlocks the 'Combat Blitz' ability
+60% turret rotation speed, -25% scatter
-30% reload, +20% rotation speed, +10% ac/de-celeration
+12.5% range, -25% scatter
+53.85% accuracy when moving, +45.8% sight range
Panzer IV Medium Tank
Unlocks the 'Blitzkrieg' ability
+30% armor, +40% weapon rotation speed
-30% reload, +20% rotation speed, +20% ac/de-celeration
As you can see the OKW vet gives more turret rotation and reduces scatter by a very significant margin making it very effective against enemy infantry; which is what the Ausf J is supposed to be effective against. It's not something you want to rely on for AT because it's going to have problems versus multiple 85's and especially heavies like IS2's but it gives OKW something to even out the mid game.
For a while now OKW has been somewhat anemic and UP compared to Ostheer due to lack of a non-doc suppression platform that can stick around and lock down area's (The Flak Track and Kubel becoming extinct when AT guns and medium armor hit the field) outside of using their Schwer aggressively as well as the fact they had nothing between the P2 and the Panther and the P2 is dropped in popularity significantly since EVERYONE uses Guards now which directly counter OKW light armor.
Fuss spam is so common because it's much more efficient than getting Obers while Fallsch are to fragile and JLI don't pack enough punch. Personally I would like it if Obers came with 2 StG44's standard and when they got the IR StG44 upgrade it replaced the remaining two rifles. Make the LMG34 upgrade replace 1 of the StG44's.
Volks also should have a anti-infantry upgrade. Why you ask? Because right now Volks literally only exist because they can tote around shrek's. If you could upgrade your Volks for a cheaper price of say; 60-70 munitions, with 3 StG44's after converting your second HQ (regardless of what that HQ is) then it would give a reason to make Volks after minute 10. That or just make Volks come with 2 StG 44's standard at the start of the game but just make them worse than normal ones and increase the price of Volks to like 260 MP.
It's annoying that the faction that's supposed to be all about using extreme amounts of automatic weaponry have more rifle units than literally any other faction in the game.