ALL WEAPON TEAM ARE 4 soviet get 6
Which was accounted for in their balance. Nobody can say the maxim is up to snuff for 260mp MG outside its 6 man crew. Mg34 is comparable in performance but is a chunk cheaper as well, before this overhaul the mortar too was clearly inferior. The zis while versatile is also "worse" in its AT role than 4 man crewed AT guns (although that barrage is pretty tight, should probably be a vet ability tbh...) the 6 man squads is a design choice clearly offset by performance.
An example of 6 men being a teching perk would be- cons are green clones, when t3 is built they get an extra model so they can trounce them like Tommy's do then at t4 they get another model. That's not the case. They pay for durability with performance across the board.
Also, is the Pak howi a Soviet weapon team or is its 6 man squad a perk from teching?
OH and also iirc the 120mm is now a 5 man squad...