Wow that world boss explanation shows they totally lost it. They are only talking about loot, accessibility and why players should kill it. WHAT? The ONLY reason you would put a boss outside in the open world is to create drama and world pvp.
Isnt this a common theme from blue posts, this talk about loot and what/how a players should play or how the player get access to loot? Where is the dynamic gameplay talk. A sandbox mmorpg game should by dynamic with events that players create not by the developers. Developers give you the tools, players use them how they want it.
And sorry Sha of Anger didnt feel epic at all. Opposite faction interfered very rarely because they knew that not attacking would get them rewards faster since the respawntimer is so short. And since the respawntimer is so short the epicness of the boss goes down aswell. Boss was to easy too.
Proper world boss = one week spawn, spawns in the evening, mythic gear drops, hard as mythic boss(but since you can have outside help it becomes more easier, but the mechanics and damage should be atleast mythic power).