Yeah, the 'Iberia winter' which was something like what they were calling it would put a huge strain besides the normal ones of a civil war. Piling on the usual resentments between regions, or in this case planets, of the nation you now have them supporting the national capital with food and other resources that will feel like a drain to everyone else long before those 10 years are up. Noted in the story was that what the Directorate looted from the other Houses & planets was not returned but rather sold as the spoils of war by the Coalition government. This was conveyed by the example of a Powerman IndiMech that had been used for decades in the mining on Itrom, taken by Directorate centralization, and then captured by Arano's forces at some point. The IndiMech was sold- not even told how, auction? direct?- to a different company than had owned so the Coalition could get some currency into their coffers. The Civil War was fought under a banner calling itself the Restoration, a call to return to pre-coup days . . . and yet those who had property stolen do not get it restored? Bad taste for many involved.
Even after 10 years and they can start growing things again or supporting livestock . . . the soil is going to be in poor shape- and you would have to deal with erosion by wind & water. Most of the land will not have been converted to greenhouses, farms would have been abandoned and definitely gone bankrupt . . . so when you CAN start using the land, who wants that risk? who would be able to buy the land, seed, livestock, or tools? Who has the knowledge- b/c the farmers are not going to sit around for the next 10 years, they will either immigrate somewhere else or shift into another industry.