Now you know the SU struggle with conscripts.
I can't wait for you to tell me otherwise.
You are correct cons have always suffered from this problem, but as with the latest state of the game the SU is in the best shape it has ever been in, to deal with it. Commanders to increase their flexibility, late game utility over Volks (reinforce other squads), hell even the option not to use them at all.
The problem with OKW isn't just because Volks are under performing late game, its due to the lack of options in the current meta. OKW has always been limited in choice of meta you can go with, it used to be hold out for Obers and panther tanks, and with the current state, a light vehicle rush into tanks.
Infantry is the weak link in giving OKW more choice with the current meta. OKW's infantry is over extended, including Sturms, a more defined role for these units is needed to correct it. If Volks are a stepping stone to Obers, position Obers so Volks can be that stone. Making Sturms so useful almost makes Volks a liability. If it wasn't for that snare, why get them. Having Obers arrive so late makes them of limited usefulness almost to the point of redundancy.
Give OKW options, don't force me to use call in infantry and vehicle rush. If changing Volks gives me more options, do that, if bringing Obers into the meta does it, do that. Anything that gives OKW more choice in meta will go along way to making this faction interesting.