That's the key point - you are putting 100% of the energy into an animal, not 80% into the animal, and 20% into the ground.

I've shot 1-3/4" cutting diameter expandibles for years now. Very rairly will I get pass throughs unless the animal is perfectly broadside. Many times I would only get 12" of penetration as most of my shots were quartering away and I would hit heavy bone or mass on the opposite side shoulder.

I don't care if I get a pass through or not when blood is hosing 8 ft. out of a wound and I can see the blood trail for 50 yards before getting out of my tree. Very rarely does a deer even make it out of sight for that matter! When I get results like this, I don't care what my arrow does. It kills em dead, and fast! That is what I want to do, I don't care about two holes as much as I care about causing the most tissue damage as possible on an animal. That is what kills them fast!