I think that this is another 'political' - like "Field of Dishonor" - to bridge between more-active stories.
I suspect that Weber is also still mentally 'changing gear'. He commented in an earlier book that he was now trying to achieve his ultimate aim within Honor Harrington's lifespan, instead of leaving the finale to her children; this is to be done by taking up an idea that came from an 'Honorverse' collaborator. As started in "Mission of Honor" he now groups chapters by month (like the 'Safehold' novels); this means that the various threads of the story each advance a little bit at a time in parallel. The mental disconnect this can cause to the reader is best dealt with by reading the whole book (all 450-odd pages) at one sitting. I will admit that I did skip one apparent action sequence during my first reading, because the month-dating showed that it was just a simulation exercise. Once you have the whole picture, you can afford to go back and re-read the bits you want, in whatever order you want, to cement the story in your mind.
It surprised me, when I looked back, that the writing of this series now spans 19 years. It still seems to have some way to go, and this book is as essential and gripping as any, but sufficiently complex to daunt some readers.