I agree with the part where the cause of death is loss of oxygen to the brain, but from there on, cutting, and bullets do it in two, totally different methods! Neither a bullet or a blade HAS to pass through to do the job! The main advantage of a complete pass-through is a better blood trail.
Again, O2 loss IS mainly the cause of death, and an arrow IS as deadly as a bullet, but all the "talking head" articles don't change a thing! There IS a difference!
Have you ever seen a deer shot through the heart with an arrow? There are cut damages in, and cut damages out, with a neat cut through the heart, with little evidence of its passage! With a bullet you are lucky to tell the diffence between the heart and the rest of the internal organs that have been totally distroyed!