The Overpowered T70 shouldn't be used as a metric to not change another unit in its tier to something more useful anyways... As forgetting the su76 making you helpless against the p4.... What? You know this is an AT unit primarily right? Like... It shoots tanks.... That's what it does.
In which situation SU player will build SU-76? Right, after early lost of t-70, when you play T1. That means only what i said before - +165 fuel handicap for axis only to achieve T4 (SU-76+T4). Who in sane would build SU-76 to counter P4, while much better do it or by zis or by 2 baby-at guns? If it was good tactic (build su-76 to counter P4) we at least saw such movements on tournaments at first then on pro-games and finally in SU meta. Or i miss something?
Every lost SU-76 will also give for axis +75 fuel free time. While Axis player could play on his T3 against you, for you it will be road to dead end. You need T4 to get your T-34, su-85 and heavies.
Furthermore, WHEN the T70 gets nerfed a version of 7man could be moved to t3 to compensate for the power spike being blunted and focused on a single unit and instead the power spike would be in conscripts where it should have been in the first place. That alone might give rise to seeing more halftrack support.
How this correspond to T1 oppening? While it good suggestion, but i think IMHO it will increase power of SU more than now. T-70 is strong, but 7-th cons are stronger in my opinion. And i even don't say about such thing that cons are T2 openning, for T2 openning you don't need SU-76, you have zis.
But back to the su76 and how giving it smoke and a slight scaling rework works- the synergy with T1 would be astounding. Giving smoke to normal penals would be great, furthermore AT penals would help the squishy su76 keep from getting Dove on. It's practically a match made in heaven. You get a zis and a mortar all in one mobile and armored package and those are all things that T1 lacks
No smoke for regular infantry. Or you want to see how penals smoking way to OKW bases?