Because space exploration was dangerous, near-immortals devised ways of making highly gifted, highly trained starship crews from their own bodies. With computers and genetic engineering, they created compilation humans.
A nice little story about making your journey through effectual immortality and the inevitability of stopping off that treadmill, of ennui and boredom and -- an end.
It feels very much in line with the Great Ship universe, far in the future and deep in well-established tech to be thoroughly abused.
Honestly, I felt like I was eating a bit of high-class sushi picked off a conveyor belt as I read this. Take that as you will.
Personal note: If anyone reading my reviews might be interested in reading my own SF, I'm going to be open to DM requests. I think it's about time I get some eyes on them.
Unhappiness. I can't help thinking of The Ones Who Walk Away from Omelas. No characters, just a juxtaposition of stereotypes, with a bit a didacticism thrown in to give readers an out. And beautifully written. This Guest is the same story in different clothes, without any purpose beyond contemplation; what would immortals do? Homer's pantheon had fun. Why not? They knew they weren't really immortal.