The point is because the body has more important things to take care of they're mostly arbitrary thoughts/experiences. Also our recollection of ordinary event/memories is suspect nevermind during moments where thing go awry.
These experiences are maladaptive because any mechanism that costs energy and without use is contrary to fitness. in evolutionary psychology the first assumption is that we work via evolved psychological mechanisms.
This gives us a series of 'paradoxes' from the evolutionary perspective, for example:
A) Self-sacrofice for those you are not genetically related to
B) Homosexuality, as you are 100% related to yourself, so all other benefits are outweighed
C) Near Death Experiences, since mechanics related to death-experience can never be selected for
We could start new threads for A and B, but C is interesting in and of itself. However, from this perspective there are a series of categories into which mechanisms must fall:
1) Functional (improve fitness vis a vis reproduction)
2) Random (noise that got caught along for the ride)
3) Vestigial (they used to be useful but now they are not)
You might say you are arguing the outcome is 2, random. The problems are:
I) It is the least satisfying of answers, as it's kind of a catch-all
II) It is semi-culturally un-bound, culture being a driver of randomness
III) Randomness should be overcome if it has maladaptive outcomes unless there's a fitness valley to losing it
You might argue III) That there is some other mechanism being undertaken that has 'brought along for the ride' a near death experience mechanism. Which would mean that such experiences would be any of:
i) Incoherent
ii) Coherent contingent upon some other mechanism being activated
iii) ???
I noted that the experience is coherent and asked for what other mechanism might bring it along for the ride. I get that it's your argument (some sort of survival mechanism) but we NEVER see it in any other situation; and as we established death-only mechanisms are maladaptive. Since coherency comes from psychological mechanisms and there is no other 'tag along' to justify its experience, presently we cannot explain near death experiences from an evolutionary perspective.
If you would like to come up with some explanations, particularly if they are predicated on a new iii) then we can discuss ways at getting at if your proposed solution makes sense.