I would like to see such content like this added in ESO to make things more flexible and annotating to those that like seeing interesting challenging content without smash and grind on the puzzle in mind.
The boss is where we have to use our horses to escape the terrain collapsing and being nuked on to make it to the other side. The true challenge is everyone have to survive or you all have to start over again. For example like a bridge collapsing behind you crumbling because of a battle occurring. Basically you want to get somewhere safe where it's high ground and stable.