I play since Friday so I`am not very experienced but the barracks seemed to be unnecessary directly at the moment i saw them, I`am glad that I found this threat because I`am thinking about their benefit in the game
So I even think, that the Barracks are not necessary or even helpfully. If "housing" is wished perhaps something like a "training ground" (first missed attack or parade of the trained unit hits instead of missing in the next game).Or an Blacksmith (first hit with a units weapon who where at the blacksmith caused additional damage for the first hit). Later we can perhaps dream of an "siege missions" where the own warband is attacked and has to defend their camp and you can buy some upgrades for the camp like spike-traps, barricades... this could be some kind of "endgame mission" when your warband is still optimized and you don`t know where to put your money or something like this.