The 2nd buck I killed this year was about as clean as it gets. He fell where he was standing. Took the top of his heart off. But I hear what you're saying.
I am the opposite of a detached harvester using a tool to gather food. The adrenaline rush is insane. It's a good thing I shot so much from my hind feet as a kid; I'm pretty good at grabbing the shot as it goes by, so to speak, meaning as I'm wobbling.... , but as far as coolly holding perfectly still, calmly doing whatever.... no. Killing big animals is a very intense thing for me.
Exceptions are when it happens so fast there's no time to get overrun by hormones, or when it takes so long that it runs its physiological course. The nice high desert mulie I killed some years ago at just over 600 yards was the latter. It took so long to set the shot up that I was kind of a zombie by the time I pressed the trigger.
