There is quite a simple reason why we know so much about the warfare methods used by the various cultures - most of the time we see them preparing for a war or fighting in it. You can hardly expect long descriptions of what the Wickans do in peace time during the Chain of Dogs, it would feel quite forced and out of place. Personally, I'd rather have such depth than Jordan's repetition of the same things about certain nation over and over again. I really like his world but if I read one more time that the Domani women are the greatest seducers and traders I am going to throw the book into a law or something. Erikson's world depth is enough for me, maybe because I'd rather know some tribe or nation's history than what clothes they usually wear or which is their favourite food. In the case of the Edur we get to learn about the feuds between the tribes, the courtship and marriage customs, the magic that they have, the role of the Letherii slaves, the hierachy, the role of the ubloodied warriors, the fact thay depend on hunting seals for food etc. What do you want Erikson to do? To spend 50 pages describing a typical day in the life of your average Tiste Edur or something?