Midcore content is content that is challenging for the casual player that wants to get into something harder. Extremes are the perfect difficulty for midcore. It can be punishing, but it isn't so punishing where one person making a slight error wipes the entire raid and we have to start all over again. I would save such mechanics for Savage raids and above where positioning has to be so precise otherwise it's game over. The overall difficulty of the 3 Extreme trials we do have are around the near perfect difficulty for your average midcore players.

Putting a mechanic that wipes an entire 24-player alliance raid if one person messes it up, is not it and it's not midcore.