I never said it was more devastating, I said it had a large Area of Effect. I don't know why your making such a stickler point out of this.
The ST does have to rotate to shoot, as it has no turret. And obviously you won't reverse at the enemy but you will need to keep re-positioning it in order to be able to shoot at the enemy since the angle of you relative the enemy keeps changing because your main gun is non-traversable without the rotation of the tank.
The day you signature was born I actually decided to delve into the stat files myself with extracting, so I can pretty much always now exactly whats going on. And honestly? The call out culture on these forums is so insanely toxic that every time there is any kind of argument it instantly devolve into people focusing on a single wrong small piece of information totally ignoring the actual content of the argument.
Sturmtiger has more range and can shoot from FoW because of this and so its rotation to shoot really doesn't effect it unless you drive into the enemy.