First, what is a sandbox activity ? It's an activity that allows players to define their own objectives and goals instead of doing those defined by the developers. It's an activity that is supposed to let players use their curiosity and creativity in order to play the game the way they want, not the way the developers wanted. Now let's have a look at Storm Breaker. Can you define your own objectives and goals ? No, everything you can do was defined and decided by the developers. If you want to go to the location of the Storm, you can only do it the way the developers designed it. If you don't want to engage in Pvp, but just explore the place, you will be forced to Pvp because it's not up to you. If your objective is to discover the story and find out what happened, but without killing anybody, you will be forced to engage in multiple combats and bloodbaths just in order to get a few informations and audio records. If you want to get loot and enter the locked doors, the only way to do so is to use the way the developers designed it. In the end, nothing here calls to player's creativity since it's just a new Pvp location and the only way to do the content is the way the developers designed it.