Why dont they just allow us to attack engaged targets only in large PVE events, like every mob has his name on red so is an attackable enemy for everyone, and leave the rest of the claiming system as it is, like if those events were instanced, and if you get to that area you have to accept entering that area with large PvE fight or decide to stay out of it and wait till it ends, and if they want to distribute exp to everyone at the end of the event would be fine, having a different reward for victory or defeat... just my op.