No what's supposed to happen is we moan an whine about the Stug being OP for doing it's job and get it nerfed...oh wait that only applies to USF's Jackson (and apparently the Pershing now) nevermind.
If you're not going to revert the BS done to it there is no point in bothering to tweak anything else. Making it have better AT is completely pointless because the Jackson is better and more readily available.
Balance fked up big time with this unit. No two ways about it. I don't know why they thought all heavies had to have the exact same attributes.
There's a difference between "doing its job" and "being OP".
The STUG is a reasonably slow, case-mate, 50-range, 170 pen TD.
The M36 is the 2nd fastest tank in the game, with a turret, 60 range, 220-286 pen, 50% better moving accuracy, and a vehicle crew (self repair + target dropping).
They're not really comparable.
Also, note the "63% pen chance". Even if (somehow) a Pershing is ambushed by two stugs, you've got ages to react.
As for 'all heavies having the same attributes', they don't. They have different armor, speed, turret rotations, vet, ranges, pen, damage, rates of fire, and even prices. All the heavies
did need a nerf to AI power, though, since "heavy meta" was far too dominant.