They're not, really, that's the point. I remember you harping on this same exact subject months ago and literally a dozen people pointed out why you were wrong (specifically about matchmaking, I actually agree with you otherwise).
Assuming no exploits / bugs, anyways

.
It's actually tiring debating it with you because no matter how many examples you were given, it went against what you wanted so it was irrelevant.
On the topic of matchmaking...
Realistically, what do you think is why people are for and against?
People who want it don't want to hit up a website on their PCs or Tablets to find people to play a game with, and have it be the only way. There is no way to even find people in a hub etc.
For people who don't want it, don't want it for the exact same reason why I don't feel like ever playing VoG anymore. Because the only people who still play it tend to be trash outside of teams who are already fully set. If matchmaking was included, do you really think the good players wouldn't use LFG?
CE is interesting because I have been able to walkthrough entire teams of underlevelled or unexperienced because so long as you have a mic and people are listening, you can work it. So matchmaking would actually work for CE outside of Hard mode.
I would entertain the idea of having matchmaking in Normal Raids tbh. I have thought about it, and it should be done by having a matchmade fireteam have to pass something like the first door of VoG, before matchmaking with another team (like how GW does it).
Sometimes I will turn the game on, solo a Nightfall and see two people or something in the public area before the Darkness. I will invite them to my game, and I get "no I haven't had a team to do the raid" so many times. I am excited about this new DLC because it means I can probably do that again.
If CE was before VoG, I would have hated that I couldn't solo or help small groups through. Now this next 3 man thing might be hard or not, I don't know, but I like the sound that I don't have to find a full group of gjallahorns just to receive a Crux of Crota.
However, matchmaking NEEDs to be able to turn off. In weeklies I hate having teammates that are honest to god so bad, it isn't worth having them in the team as they just make the enemies have more health if they keep dying or don't skip ads that can be skipped.
Put in a choice, and it doesn't harm the people who go on forums specifically to find a good group. Hell, LFG will probably have weeded out all of the shit players you don't want to play with if that happens.
If we are going to not have matchmaking, or a game where matchmaking can't work because it's like playing Halo Reach's Fireteam on Legendary with scrubs, then don't force us to find 6 people with no possibility of finding them in game.
Nightfalls > VoG specifically for this reason.
The problem I have is that a majority of the people complaining don't even make an effort to go into OT19
As someone who plays on XBL, the OT doesn't really help all that much.
360/PS3 are also screwed.