You are entitled to your opinion but your own sentence, in my opinion, means that conscripts kept receiving buff including the 7 men because vs "STG Volks, were useless."
Point is that the LMG grenadier are irrelevant to 7 men conscript.
Kinda. Let me explain. I'll separate this in 2 parts.
OKW: either pre rework or post rework, Conscripts were not a good option against OKW. Be it Volks, doctrinal units or Obers. Keeping the focus on STG Volks is missing the whole forest. Yes, they were the most recent and biggest issue but ignoring the rest is just failing to see the context on which the change was finally applied.
OH: Yes, the LMG is the least concerning point regarding the decision on making the 7 men upgrade. That's why i said that the changes as a whole faction which is a consequence of the power level of how the new factions were released, have given space for Conscripts to receive some kind of late game upgrade.
That contribution to space was also done through nerfing most other opening to some degree (Penals, Maxims, Doctrinal units) and AI tools (T70, mines/demo, mortar, KV8, ISU)*.
Cons/Grens struggle equally on late game but for different reasons. This is why in their match up in 1v1 they were fine, but once we incorporate teamgames, thats a whole different issue.
*Yes, some of those units are still strong. But not strong as to make the whole army composition work around.