calc yourself the options to get an AT gun and indirekt huge range teamwiper for OKW / ost ...and than for sov.
Ok.
Calc yourself the options to get rocket arty of soviets vs okw.
Calc yourself the options to get a mortar and AA HT for soviets vs OKW.
Calc yourself the options to get HMG and sniper for soviets vs ost.
Calc yourself the options to get reinforcement halftrucks for sov vs ost.
Calc yourself the options to get weapon upgrades for mainline inf for sov vs axis.
Calc yourself a brain and beat into it that factions have different techs and different unit combinations available cheaply compared to a completely different faction.
i bet both would need minimum double of the costs from sov. sov could from the start into zis in under 1min. and have now the double function from it.
And guess what?
There is absolutely nothing wrong with that, never have been for past 7 years and nothing will change here.
Go ahead, do exactly that, see how long the game will last.
Build ZiS as your first unit and tell us how well it went.
ost and okw need minimum 4 min for both options. And a tone of ressources
And again, there is completely nothing wrong with that, because
1) No one sane rushes ZiS and the only early ATG to get that makes sense is puppchen for its retreat capability and insta countering of allied ultra lights.
2) Factions have different benefits and units within their techs.