Well I just dont find k98 volks to be cost effective as the game goes on. They are alright at first when they are facing infantry without upgrades but 5 man sections-let alone 5 man sections with brens- BAR rifles, 7 man cons, penals and any number of other infantry are just going to trade too well with unupgraded volks in the mid and late game. The MP44 is currently a necessary upgrade to keep them scaled properly.
Not to mention all the elite infantry options for OKW are superior long range options to K98 volks both in actual performance and cost effectiveness.
Other allied upgrades are problematic too, but are a symptom of the stgs not the other way around. Adjusting volks and the way rifles interact with Bars should be done at the same time (I suggest limiting hem to 1 BAR until vetted so they don't power spike so dramatically but instead scale) and tommines need a whole rework. 7 man cons are a non issue in the okw match up simply because they would get murdered by obers (as they should) and volks in cover or with any support would do well enough now that cons lost the cover bonus.
Volks scaling should be mostly from their vet. The vet that got gutted because of.... Drum roll please.... The fucking stg upgrade. Okw elite infantry specializing in long range firepower is why volks should refine to close range so they don't step on toes and promote diverse builds. Volks were never meant to go toe to toe effeciently against upgraded allied infantry that's why okw has a strong starting unit and an uber late game AI unit. Volks shouldn't be filling the same role as rifles but lite, they are a different unit in a different army with different (and more accessible) support units.