Andy, that most recent topic of yours points out why the Christian heaven would eventually prove to be punishment.
Utopia is boring.
To quote the angels...Perfection ain't all its cracked up to be.
Or you might consider that complete self-absorption by its nature is isolating. Once needs are met, and even most conceivable desires are met, if those desires don't become all-engrossing or destructive, the mind seeks to place itself in its setting. The need arises for 'higher purpose'. And I don't restrict that to the concept of a utopian heaven or blissful afterlife, but a broad notion of something greater than oneself, and a purpose to strive for, including such concepts as Group Survivial, Freedom from oppression, Service to a Deity, Duty in an Honour System. The list is as big as your imagination.
Each of the factions have their ways of addressing this element of the human psyche. I suspect Andreus may find his own way to addressed it too.