I honestly don't think raids should have matchmaking for the same reasons that you list. But when you look at the participation rates by activity it kind of begs the question of why are raids such a focus in this game. They are literally bungie's crowing achievement, and that's fine, but they have like a 5%-7% participation rate. As far as new modes and things like zero hour/shattered throne, those things should have matchmaking. But what I'm really talking about is Crucible. I'd even go as far as to say that Crucible should have a focus on solo play as far as having some kind of solo based rating or ranking. I think the idea that Destiny is at its core a multiplayer game, which it is, (this is actually one of the things that Bungie has said unlike a lot of the comments that people get out of nowhere when they talk about what kind of game this is) has actually hurt PvP in that it's basically an excuse to let solos be thrown to the wolves. And this has led to a lot of other problems that have led to people giving up on the mode. But you are definitely right that one of the main aspects of Destiny is that its a multiplayer game. I just think Bungie should be careful about going full force with that approach in everything they do. Especially if they are looking for ways to bring the player count up to where it should be.