As I see it, people keep developing mental constructs to make the experience of their own existence feel more meaningful, more important and potencially eternal, because the thought of insignificance and eventual death is just too scary.
For all the words we can use on it, it's lost on people who never had thoughts and experiences that prompted them to be curious about the nature of consciousness and reality.
It's like discussing the bitterness sourness of a lemon with someone who never tried one.
It amazes me how many people will take the specialness of their experience as a given, even when thinking about the big picture is literally their job.