Invictus,
With NDE you come up against the same obstacles that anyone else does. Christians attempt to testify to the Changes that they experienced in their life account of God's Holy Spirit's baptism. Christians attempt to share their conversion experiences and yet it all comes down to if another person will accept what you say as valid. Often it is difficult to have someone who has not had such experiences to believe your testimony. NDE's are responsible for a total change in the direction of many people's lives. Sometimes those changes are so profound that they adopt new careers or up and move and rededicate their lives in a 180 degree direction from which they were headed before the NDE.
Like Christians who testify to a total transformation of their lives and who will maintain their faith even in the face of death or persecution the changes in a person's life are not sufficient to prove to people that what they say is valid. For some it should be cause to question it but since it is not physical proof, for many, it carries no weight. It is to each to accept or reject that each persons account of what they experienced is real or factual. Even testimony that recounts activities in a surgical room where a person is totally out or referencing things that could only be seen from up high, far above the height of anyone in the room, does not seem convincing to some that a person had an out of body experience. Then again NDE and Out of Body Experiences are two different things, at times.
As I said none of these changes or accounts is factual proof that it is valid but at the least it should give reason to investigate it further and at least consider it's possibility or that there is something to the reports.
Just my opinion.