My sentinents exactly, Tom.
Years ago, I-to thought - head shots - perfectly instant kills! I did it a couple times on moose, was lucky but decided I liked my moose, elk or deer completely bled out which happened much better with a hole thoght both lungs. Holing both lungs gaurantees a kill - the animal cannot live with a decent sized hole through both lungs. After that, if you want or have the time to break it down with other shots, go or it. The Double lung makes it a kill.
TNow, I do now like brain shots. The brain is small enough in most ungulates, it's too easy to miss at normal ranges, let alone longer shots. There's lots of bone in there to deflect a ball or bullet. Nerve shock form a 'close miss', if that's all that happened, can be quickly overcome with the animal making good it's initial escape. With no snow to track, it will perhaps suffer a starvation death, or worse maybe - being eaten alive by coyotes or wolves. I do not like head shots. The broadside lung shot, which also includes the liver, provides the largest kill area there is on an ungulate. My opinion is quite strong on this topic.