This and this.
"What will their commanders have now, then?" is just the start.
Less about the Commanders (USF wouldn't be affected because their 75mm is completely unused) and more about tank balance. You'd have to rebalance tank combat to account for it being T-34-85 and M4A3 76mm units against the Panzer IV's and Panthers. Particularly the Panzer IV's, which Ostheer's is already considered lackluster.
Or perhaps add more T34/85 to the commanders
We need more Elite Ace T3485s
Swap T-34-76 with the commander call-ins, and have an elite T-34-85 in Advanced Warfare?
As a adding MG34 and PzIV for OKW?
That was because OKW didn't have Basic Infantry or a Machine Gun or a Medium Tank, so it made them an awkward faction that was hard to balance. With new Volksgrenadiers, the MG 34, and Panzer IV Ausf. H added they have a core army that can be balanced around.
and the t34 76 is actually pretty decent right now. 75 sherman just need a buff.
I could get on board with giving Shermans 720 health to make up for the lack of 'shield' units. The Easy Eight already has it, anyway.