StuG and SU76 changes are a bit perplexing. These two units were already pretty bad and changes on paper seem to make them worse, but will have to see how they synergize with all the other changes.
I was surprised too, mainly at the armour decrease. SU76 did get a penetration buff though, which is very nice in my mind. Considering you can build so many, having them bombard infantry to the stone age, and then mobbing up to attack armour will be more effective too. Maybe they'll be more of a glass cannon style unit, or even just more spammable since they have better offensive capability now?