How can you focus on survival when you are knocked out cold? Why would this pain deaden you while you drift off to death?<quoted text>
It *can't* be at its peak because it doesn't have the fuel required. Oxygen is needed to restore the ATP needed to run the system. The feelings and story were made up *after* the period of inactivity and 'filled in'. We know the brain does such 'filling in' in many situations, producing 'memories' that are out of order of the actual events.
I doubt it was produced by evolutionary pressures. The release of endorphins in response to pain has a definite evolutionary effect: it makes the pain recede for a while, allowing focus on survival. The side effect is the hallucinations from the opiods. In the case of NDEs, the story comes from the 'tunnel vision' produced by anoxia and cultural expectations that are filled in later.
You say there is fill in. Yes, there is to a degree after you regain consciousness, but your brain is working during that period, and in an orderly fashion for a lump of meat. Plus you have to have stored input to be played back in that reconstruction. It doesn't get stored unless something controls that. Reference what I said earlier about mirror images.
If your brain can reconstruct after an event like that then you are in a constant state of delusion. Your belief in "reality" is one of those.
This is too complex to discuss on a place like this, but you must understand I went through the experience, and from reading my posts it is quite apparent I don't believe in poofs or magic and can get into serious detail in analyzing how something happens. You are trained to follow a logic. I was trained to understand logics and how they originated. Those examples you give are extremely simplified block type thinking that are nothing more than rationalizations for not being able to get into the details of how such could occur. The fact is there is order and a certain coherency to those events that can't happen on such a consistent basis purely from action/reaction of molecules. There is an unseen direction to the interaction of those molecules.