Therein is the problem. For the most part, until Cata, I felt you could drag your social group through content with time. You might be behind and some encounters like Kaelthas, Yogg, Mimiron hard, or Lich King really made you want to boot your 54 year old grandad Hunter that was just fun to be around but wanted to stay warm in fires, but overall you could compensate. I think Mimi hard and Lich king heroic were the only two I think we had to come up with reasons to sit people. Completed optional content. I don’t think we did Yogg + 0 when it was relevant. My guild was semi casual by then. We were mostly content with LK normal 25, but we did push on because we liked each other.