As topic.
Moving StuG G to Ostheer T2 and/or put a small unlock cost like AEC will make Ostheer life so much easier against mid-game light vehicle harassments in 1v1 or 2v2.
And considering,
1) StuG G in T2 will comes out around same time as T70/SU76
2) StuG G can't kill infantry
3) StuG G still get penetrated by everything like PTRS/Bazooka.
4) It still costs 90 fuel
5) Ost T3 comes much later (40 fuel tech + 75 fuel building)
It makes sense to put it in T2 as a late-light-vehicles-phase-counter.
Then just put Werfer/Panther/Brummbar whatever to fill its spot.
