That was some good reading!
There is another side of that coin too, while there are deer out there ready to launch at any sound I can only speak of the ones I have shot at. I took a 30 yard shot at a doe, she was on one side of the riverbank, I was in the river. She paid no attention to my bow being shot, or the arrow in the air, all she noticed was the sound of the broadhead burying itself in the tree behind her, I was sold on silencing devices at that moment (range finding devices too..).
The other thing is the confidence that is an absolute necessity for hunters, you have to have confidence in what you are doing in order to complete your shot effectively. Some of us gain that confidence by modifying our equipment, tweaking this, adjusting that, building something to attach to our bow or finding a way to do without something that is already there. Sometimes the differences are minimal when it comes to the performance of the bow, but can be paramount when it comes to that moment when you make the decision to release the arrow. The equipment in our hands is important, but nowhere near as important as the equipment between your ears, and that is what is affected most by minor modifications.
Like any other hobby, adding your own personality to it builds confidence and only adds to the experience.