The problem is you cannot buff core infantry first without nerfing the maxim or snipers or shocks because then you would just have a superbuffed Soviet army. When those things are brought in line, then and only then will it be right to buff the core infantry.
Actually, you can.
Kubel just got buffed and guess what?
Volks weren't nerfed in return.
In fact they were buffed so now they are cheaper then cons, scale better then cons and stomp cons in every single situation except at vet0 at point blank range.
Yes, kubel is not infantry squad, but it doesn't cost any fuel and infantry is its intended target so that comparison is valid and if you're still stuck in denial:
Long time ago when MG42 was batshit OP relic didn't buffed grens when they nerfed MG.
Buffing underpowered unit isn't and shouldn't be a warranty to nerf other unit, especially if that other unit is considered fine by most top players. If unit is balanced at top level play then it is players issue, not balance one if he struggles against it. In this case you can't nerf it, because it imbalances high level play, but you can't buff player, player needs to buff himself alone. This is the case here as both OKW and Ost have early available hardcounters for maxims. Refusal to use them doesn't make them any less of a hardcounter.
But you also have to bear in mind that Soviet troops are not by core design, meant to be as efficient or deadly as German counterparts. The "Enemy at the Gates" vision that was originally implied in Beta should be maintained, because that's how they decided to build the game.
What if I told you that this is pictured by squad count difference?
1 con model doesn't equal 1 gren model and so on.
This is how it is pictured in the game.
Otherwise, if one unit is more effective then other one, there is absolutely no logical reason why this more effective unit should be equally priced, which means your assumption supports grenadier price increase or conscript and penals price reduction more then anything.