Can you identify any single change that has a non-positive impact on 1v1/2v2?
The elefant and jagdtiger nerfs are justified in 4v4 perhaps, but still questionable since medium spam is a reality in 3v3 and 4v4. If you nerf them like you claim, there will never ever again be a reason to get a JT or Elefant in a 1v1 and the reason to get one in a 2v2 is questionable to say the least. Why get them if they can`t fight medium spam effectively? Not even a cost decrease?
Making Sturmtiger mutual with KT and nerfing its damage vs tanks. This will mean you will see it even less than you do now.
Trying to up the Crocodile´s main gun damage whilst not addressing its huge health pool or fast turning rate.
Not addressing IL2 bombing strike as being a one shot to howitzers etc.
Nerfing stugs. I am oke with the TWP nerfs, not the pop cap nerf though. Since there seems to be refusal about buffing the subpar Ostheer Panther in any regard, T4 will still be a rarity in 1v1 and 2v2. People will simply rely on trusty T3 units. Now you want to nerf them with a pop cap nerf and their TWP. This means T4 will still be unreliably and unviable, but T3 will now be more weaker since Ostheer p4 isn`t that great either.
Adding a lofty fuel cost to howitzers. Since we literally never see them in a 1v1 or 2v2, adding a fuel cost to them in a game that is driven by getting fuel early and securing favorable tech or call in spam to amass tanks seems so illogical to me. Same goes for the OKW Pak43. OKW is a very fuel taxed faction that now has to lobb even more fuel in their to get the pak43 lol. Good luck in 1v1 in a very hard fought game. Even their medium is a 150 fuel.
I however like the JP4, repair speed, firefly, emplacement/ISG, aura, usf pop cap abuse and demo charge reworks.