but it doesn't matter how good the call in infantry is when the core infantry leaves little to be desired
To be honest, it seems like you're just looking for an excuse to pick on Volks. Volks are really good mainline infantry, but they are not as powerful and irreplaceable as you make them out to be. Panzerfusiliers, Jaeger Light Infantry, Obersoldaten and now the Sturm Offizier and Falls are all great and popular picks.
The Offizier costs only 20 manpower more and doesn't need munitions for a weapon upgrade, and ultimately becomes pretty much twice as good as a Volks squad and comes with very good abilities on top for only 10mp/model reinforcement cost more. At 2 CPs it easily fits as the 4th infantry squad instead of another Volks/Pfussie squad. The sheer combat power and utility that the unit brings is definitely worth replacing a Volks for imo.