Way more animals are lost due to poor shooting or shot selection then are ever lost to poor penetration. Reference every fall the number of "missed at 8,10 15 ...... yds" threads on the various boards. If you are not getting full penetration on NA animals with the typical 45# or larget setup, your tuning is off or you are hitting them in the wrong place.

Most trad hunters would be much better served learning to be more accurate and when (and when not)to shoot then obsessing about how much deeper in the dirt to get their arrow.