While the thematic connect feels managed by all three parts, across 5 (I think?) narrators, in worlds possibly connected (we’ll never know, since the author focuses on the granular human experience and does perfunctory worldbuilding), there are numerous structural issues.

Primarily, with the change in styles from each, the middle section is just lacking prose wise, and the subject matter less well handled. It was an absolute grind to get through. In the third section, the voice is most captivating for the epistolary account, yet the form is bay far the most contrived, especially when attempting to convey world building in sloppy ways (as you know:, etc.). But the section as a whole manages to draw together the thematic intent quite well. And we actually feel situated in the time, unlike the previous two sections.

So, if you are solely interested in granular human interactions and thematic connective tissue, I think you’d like this very much.

If you need description of the world and for the world building to be well handled, and want a practical way of connecting each section, you will absolutely not get on with this. It has sophomoric issues you see with sci-fi novels combined with literary issues, such as being unable to figure out how to do exposition in an organic manner.

If you are a theme reader, you are going to find gold here.

If you’re a character reader, it’ll be a mix, I think. It’s possible you’ll get on with every character, but I didn’t. The spectre at the feast that is theme haunts their thoughts and emotions. But the prose and interactions are wonderfully drawn.

And if you’re a plot reader, you will probably hate it; as the stories exist merely for thematic cohesion. There is no complete plot, nor is pacing generally a factor.

If you require all three to be adequate or great: Run.