So far this discussion pretty much tells the reason why, unless I have a Texas Bulleye, I'm always going for a head shot.
People don't realize how small the vitals are on a turkey and that they're also obstructed from perfect view by a ton of feathers.
Also, people don't realize the vitals are just about the same size as the head and neck area on a turkey is.
I remember when I first started bowhunting turkeys years ago, the number of times I had to track birds which went two to three hundred yards before they died. Not because it was a bad shot, just not perfect, out maybe an inch, again because you really can't see the vitals on a turkey.
You hit a turkey in the head and they drop like a stone. Also you either hit or miss. So yeah, pretty much always a head shot for me.