The machine planet is for thinkers, the sort of people who find the idea of agonising over whether or not they died appealing because it gives them something really interesting to think about.
The living planet is for feelers, people who don't care about the loss of the self concept if it means they don't feel death, indeed becoming part of collective consciousness would probably feel great, you'd never have to feel lonely ever again.
The etheric planet is for pussies and subjectivists, people who take comfort in their ignorance or take ignorance as an excuse to delude themselves into whatever they want to believe.