What you want is already coming, to an extent in d2. Guided games are going to be an in-game lfg setup built around helping solo players find a group. But, let's look at the idea of just blind matchmaking for raids and understand why we've, rightly, never gotten matchmaking for them, optional or otherwise: Matchmaking means no fireteam lead. No fireteam lead means no way to manage a raid instance, which means no one to kick inactive or unhelpful players, no one to kick someone who does not communicate or listen, no one with the ability to kick toxic or abusive players or idiots blasting music or (and yes, I've heard this when when doing Sherpa runs) someone blasting homemade recordings of white supremacist speeches or some other form of hate speech, no one to actually help tie together the band of misfits you joined up with and make decisions like what strategy to use on a boss or instance. No one to boot people who have such bad lag as to ruin mechanics or components of an encounter. No lead also means no one who can take a group to orbit if something gets glitchy. Now, having a fireteam lead can be just as bad. What do you do to stop one from abusing that power and booting people just before an encounter finish, or booting people in favor of a friend who pops on partway through a raid? How do you treat checkpoints? That would become a massive headache in and of itself. What happens if your group can't get past an easy encounter and you have a checkpoint and can't get anyone in matchmaking later on because everyone else gets by that section fine? Start over? What happens when someone drops from a raid because of a network problem? How much time do you force that group to wait in an effort to let that person rejoin? How does that person rejoin that same group? I can keep going on logical reasons why straight up matchmaking is a horrible horrible idea for raids, but I'm sure I'll get some wharblegharble responses anyways.