http://www.games-workshop.com/gws/content/article.jsp?aId=22200010a&_requestid=85857----------------
Warhammer 40,000 Altar of War: Chaos Space Marines
Altar of War missions provide all the information required to play games inspired by the battlefield tactics of the different Warhammer 40,000 armies. This book contains six brand-new missions which you can use instead of the Eternal War missions in the Warhammer 40,000 rulebook if you or your opponent has a Chaos Space Marines army, allowing you to wage wars of vengeance, launch a dreaded Black Crusade, or simply unleash indiscriminate carnage on your unsuspecting foes.
Warhammer 40,000 Altar of War: Dark Angels.
Altar of War missions provide all the information required to play games inspired by the battlefield tactics of the different Warhammer 40,000 armies. This book contains six brand-new missions which you can use instead of the Eternal War missions in the Warhammer 40,000 rulebook if you or your opponent has a Dark Angels army, allowing you to hunt the Fallen - traitors of the Chapter's ancient past - or unleash the elite Deathwing and Ravenwing on your foes in all their devastating glory.
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So, this tells me that GW did not intend their "eternal war" missions to represent all of the things everyone needs to think about when designing missions for a tournament (if tournaments were even a part of their thinking at all when they chose the book missions).