It makes a big difference for AoE suppression, I found it fairly noticeable when facing the AA HT's and .50 cal. Obviously the most meta would be 3 shrek bulletins.
Why do the penetration bulletins exist for the Jadgtiger? I don't think theres a single tank in the game capable of bouncing it...
You can clearly see that the IS-2 is (way) more durable than a Tiger Tank. Pak shots are bouncing on it. You don't need Austerlitz, but Looney for you to show it.