Conflict in space seems to change many of the traditional aspects of war. Strategy formulated on the value of capturing enemy territory doesn't seem so straightforward as it is now. Wars in today's world have clear cut objectives that are more easily seen and understood. Cutting a swath into enemy territory allows an army to reap the benefits of foodstuffs and materials along the way - benefitting from the seizure of industrial plants and slave labor as well as uninterrupted supply lines from linked lines of conquests.
This benefit does not seem to be so readily intuitive or applicable in the Honorverse. Large costs in time, manpower, lives and ships seem to downplay the value of captured enemy systems. The value of these systems is not readily obvious to this naked eye - anyone care to dress or redress my peepers?
Capturing major fleet bases like Trevor's Star - which have a benefit of astrographic location and which also provides a beachhead into enemy territory and saves travel time because of its terminus, and also which affords easy resupply of deeply entrenched alliance forces - is obvious. But what is the absolute value of capturing less than major star systems, and expending so much force to do so?
When a system is captured, how are their materials seized? You control the orbitals, but how is the mandate to the captured system to give you their goods enforced? First, you have to have enough troops in transports to go door to door to industrial plants to ensure compliance. But even then, it seems, there would always be opportunities for stalling, sabotage, theft, etc.
Also, controlling the high orbitals alone doesn't seem like it'd be enough to "convince" a Technodyne or an Erewhon to conform to your plans of forking over the goods. And, simply because you control the high orbitals forces your conquest to lay down their arms or else face legal bombardment does not mean they can be legally bombarded for failing to comply with your objectives - while down on their planet - of being fed at the dinner table of their industry.
In many cases in the Honorverse, I suppose the value in capturing a particular system is more about shutting off the supply of those goods and the value of that particular system to the enemy. Their materials aren't a value to you but a value to your enemy's war efforts, which would delay new construction. I suppose this lack of value is why the infrastructure of some systems are destroyed instead of captured.
It just seems harder for these naked eyes to measure the intrinsic or absolute value of capturing an enemy system in the Honorverse.
Flag in Exile Ch. 1 wrote:"In the war's first six months," he said, "Manticore captured nineteen Havenite star systems, including two major fleet bases. Their total capital ship losses during that time were two superdreadnoughts and five dreadnoughts, against which they destroyed forty Havenite ships of the wall. They also added thirty-one capital ships to their own order of battle—twenty-six captured units, exclusive of the eleven Admiral White Haven gave us after Third Yeltsin, and five more from new construction. That put them within roughly ninety percent of the Peeps' remaining ships of the wall, and they had the advantage of the initiative, not to mention the edge the People's Navy's confusion and shattered morale gave them.
"In the last three months, however, the RMN's captured only two systems and lost nineteen capital ships doing it—including the ten they lost at Nightingale, where they didn't take the system. The Peeps are still taking heavier losses, but remember that they have all those battleships. They may be too small for proper ships of the wall, but they provide a rear area coverage the Manties can't match without diverting dreadnoughts or superdreadnoughts, which frees a higher percentage of the Peeps' ships of the wall for front-line use. Put simply, the Peeps still have more ships to lose than Manticore does, and the war is slowing down, Your Grace. Peep resistance is stiffening, and the Manties are transferring more and more of their own strength to the front in an effort to hang onto their momentum."