Vi are a 290m GP guild trying the Challenge tier Rancor raid. We are likely a bit too weak to beat it yet, but we were trying, having fun and would likely get stuck somewhere in phase 3. Which is fine. We would try it, practice and return next time with a chance to beat it.
Then disaster struck. A member had a mental blackout and took Papa Pig down below 80%. That crippled our few Rey teams from 14-18% down to 3-4% effectively making it game over.
One mistake, from one player. Game over. That is not fun. Games that isn't fun stop being played. Fast.