death is planned before incarnation?

[anagogy]

So why would anyone plan to spend the last years of their life in dementia, devoid of any 4D or 4D consciousness, pretty much a in a vegative state? If you are not there to consciously experience catalyst, what good is it? As a hospice volunteer, I used to visit patients in long care facilities. I would see the dementia patients strapped to wheel chairs, zombies starring into space with no consciousness left. What possible benefit spiritually could arise from that?

The spiritual benefit in those circumstances is usually towards others. The opportunity of service presented.

It kind of goes against the popular conception of the spirit as a singular indivisible entity, but souls actually don't always leave their bodies in one big clump. Rather, it is more like a dimmer switch. And when the consciousness dims in this realm it is because it gradually pouring into another. So often with these people where the "lights are on and no one is home" they have mostly already vacated their physical vehicles, and there is probably just a small fragment of their soul energy still residing for some particular reason or another such as providing an opportunity of service, or perhaps because someone wasn't ready for them to go yet.

Consciousness is a very fluid thing.