A deep dive on the research and development of the Death Star (or, as it's called here, Project Celestial Power), Catalyst is certainly directed to the more lore-savvy fans.

We have insight on the workings of kyber crystals, the perception of the force by non-force sensitives, the perspective of more-or-less civilians on the early days of the Empire, and a lot of the bureaucracy and politics behind the scenes.

It's basically a big encyclopedia run of the events, but the themes about responsibility and the atrocities of a dictatorship could still make it's arguments.

It's very much "little plot, tremendous worldbuilding", and while I wouldn't describe it as a fun read, it was certainly interesting.