Idk it disable main gun, and not disable engine, Med tanks can simply reverse the f out. It is not like Stug cant pen med tanks already.
The full 160 damage from twp should help against heavies, something Wehr sorely lack. Like even Panther can bounce allies heavies frontally from max range..
Panther helps against heavies.
StuGs are anti med/premium med/churchills.
There is exclusively ONE allied vehicle with high enough armor to make stug a bad choice and that one tank isn't and won't be the reason for any stug pen/dmg buffs on either stock gun or ability, because it just so happens that both axis factions already have a counter to that unit and its the same counter.