I typically look in LFG for raid groups, it's hit and miss. Sometimes you end up with terrible players who, or scumbags who boot you after one mistake, but at least on normal you can do ok. If random groups can get through most of the raid and communicate, might as well have in game matchmaking since so many are looking for teams or players. One issue is the possible lack of fire team leader, meaning one player could grief you and there would be no way to kick them, on the other hand, you could always invite the others to a new session. I see no reason why they couldn't add a separate option for matchmaking on normal, or have a built in system where you could mark the fire team as looking for player, and others could be added if they selected the option. That way you'd still have a leader, you could get a player to fill out a team, without losing the ability to close the fire team later if you want to invite a friend. This is sorely needed, as so few more players even attempt the raids, when they are some of the best content, with some of the best loot. There is no reason to think that adding this feature would dumb down the raids, players would learn firsthand the disadvantages of playing with randoms, and recognize when certain sections required more coordination. And once they see some of the content, I think they would be motivated to form their own groups for more serious attempts, but this gives you the option to get your feet wet, and find people to play with.