Quite agree, Path of One - on the one hand, in my NDE I saw each of us as nothing more than a fraction of a spiritual "True Self" that was engaged in mutliple lifetimes (human, animal, alien?) simultaneously.
Yet on the other, lots of my flashes do not fall into a easy temporal order, with some coming from different people within the same period of history.
Rather that consider that I may exist as different individuals in the same human time frame, it makes sense to consider that instead information is being tapped into if a person is sensitive enough, and the information seems relevant in some way. So that potentially the experiences of many different people can be tapped into.
The idea of treating the earth as a closed system is something I've explored before, and think is definitely worth taking seriously - but also in connection with the idea that the solar system itself is another system, the galaxy, etc.
In other words, a kind of universal "ether" where information resides and can be tapped into if able, that may or may not have local nodes (ie, the earth as local to us). These days it's not too hard to tap into this when reading a news story, to get an idea of what may or may not be behind a certain event from a completely different perspective. Unfortunately, because news stories tend to cover bad news rather than good news, it's not something necessarily good to do, or choose your stories well.
I remember a couple of years ago a business colleague went missing in America, and because I knew him, and the people worried about him, I felt strongly able to tap into this. The information was in the form of emotional signals - I felt very much that he was alive, that he was in a state of confusion, and for some reason he was physically unable to contact anyone. Couldn't make out much more than that, without my conscious mind trying to construct a story on top of it, which is not a good idea. Anyway, turned out he'd got on a plane and had a panic attack - when challenged for ID, wasn't able to present it because of the panic, and so was dumped into a local jail on landing. A couple of days later and the British consulate had tracked him down and ensured his release. Felt compelled to tell his wife about my experience at the time, but I would rather consider myself quite fallible, and would not therefore want to misdirect people in case I was wrong. The tempation to build a story to interpret the emotional signals was strong, but would have led down blind alleys because I couldn't read the actual situation. But glad all turned out fine in the end. Not all do.