This book benefits a lot from its focus on two characters, in contrast to Long Way, which was very fun but felt like a bunch of B-plots in a trench coat. The two threads contrast against each other nicely and pull out a bunch of ideas to chew on – stuff like identity, existentialism, family, community, intelligence. Sidra's story, though quite serious at times, also helps counterbalance the heaviness of Pepper's.
Pepper's plot reminded me a lot of Neal Stephenson's The Diamond Age, and it would surprise me if Chambers hadn't read it. Both Ness and Jane's stories are equal parts heart-wrenching and compelling. (Chambers and Stephenson both provide a lot of asides that are catnip to folks like me who love an extra little bit of worldbuilding.)
I love me a good woke novel, but sometimes the moralism can feel a bit tacked-on and hokey. Chambers does a good job embedding themes of tolerance and social justice in the two novels of hers that I've read, enhancing the story rather than distracting from it.