I agree on the Raids, It was just simpler to say Optional matchmaking than try to explain it. I do think there should be some kind of matchmade introductory Raid though, just to get people used to the mechanics and instill interest in the Raids. If you can get on with a decent group in the seasonal public event it can be completed with randos, I've been able to complete it 3 or 4 times with them that way. It's hit or miss, but like you said, not impossible.