Ties in well with Andor as the book discusses, realistically, how the rot set in with the Republic. How it could be transformed into the Empire with little initial protest. How the Empire sustained itself via a mix of military control, propaganda, and moving towards making the population feel helpless and thus apolitical. And how the blind sides of a rigid, fascist system led to the Rebellion winning despite the huge power disparity.
It's the perfect companion book for the series. And is a good introductory book on how authoritarianism takes hold, how the insurgents can exploit weaknesses, and what should be done, post-rebellion, to keep the fascists from returning. I think many people, who otherwise would not be obsessive about Star Wars lore, would find it interesting.
On a side note: the book does address the events of Abrams sequel trilogy with an interesting angle. That the New Republic essentially didn't do enough de-Nazification and that led to their downfall. This approach to those terrible movies doesn't entirely succeed, but does make them a little more interesting. And matches what we've seen in real life reconstructions after the downfall of various regimes.