Two important points that could be added:
- cons are much better at recrewing stuff due to higher model count and stock (and free) merge vs. four men grens and pios who very often have to die to do that (often a gamechanger).
- can can build sandbags and have hoorah (both stock and don't require tech)
At 6 men men soviets only recrew at 50% models. All others at 75%. So yes 7 men allow cons to do a full recrew. Its kinda their bread and butter since they get no nades or ai upgrade stock. And even with doc it locks out 7th men.
So 240 mp 50 muni and 3rd tier plus extra tech or full tech allows them to do it better. Kinda justyfied aint it? Since they lack other stuff.
Grens get faust and bunkers out of the gate. Next to a t0 mg. Extra starting mp it seems. Next to the other t1 units. Their lmg and riflenade gives acces to paks pgrens etc as well.
The fuast and bunker are not entirely free but pretty dam close. And put the techless mg42 into the equasion where sovs need tech for a worse mg you get a thing known as balance.
Ost and sov imo are well balanced vs eachother.
All 4 men grens need is be a bit better at long range with the lmg 42. So they can bleed approaching inf a bit better and increase their chances of winning a bit if the enemy squad chooses to comit after dropping a model or 2 on aproach.