I understand what you're saying, but what good does it do to bury the arrow in the dirt up to the fletchings when you could have used some of that extra KE to cut more of the DEER instead of driving the arrow further into the dirt?

If you're shooting 90 ft-lbs of KE with a small fixed blade broadhead at a whitetail, you've probably got way more "penetration" ability than you actually need. With that much KE, you could probably shoot a 2.5" 3 blade and still get passthroughs every time (as long as you don't hit the front shoulder bone, which you shouldn't be aiming at anyway even with a fixed blade).