Would you really want to match up with a random Titan who drops his bubble over the boss, has no mic, and is triple-wielding shotguns (Legend of Acrius in heavy)? Because that's what you'll get and more in matchmaking raids. People who have never raided, don't know the mechanics at all, they want matchmaking for raids thinking it'll be a good way to learn, thinking the raids have the same learning curve as strikes. I personally don't raid because I don't have the time to repeat the raids over and over til I learn all the mechanics properly.