The short version of what he said was that if penetration was an issued, the sharper the head the better because the blades would not drag as much
That sums it up in a nut shell. As a hunter we want penetration, not blunt force trauma. Penetration is the key, because once the lungs are punctured they will collapse, expiring the deer. You dont want a dull head stoping on a rib or shoulder allowing the deer to be hurt but still perfectly alive.
Thats my take.