In reading more about this book after I finished it, which is a hint to it's unexpectedness, I learned the author is known for a genre called "Hopeful Science Fiction." The setup, roughly speaking, is that humanity has succeeded in it's transformation rather than entering a dystopian/post-apocalyptic phase.

That mindset makes this book a joy to read. It offers up a very rich and peaceful world to explore, with introspective characters who encourage reflection on the human condition.