The thing is... The stuff in MSQ Roulette is intentionally limited.

Due to the fact that they're the 2 MSQ necessary 8 man Dungeons that have about 5 years worth of cutscenes in them.

This means that, not only do new players NEED to do them in order to progress the MSQ, but that they also need to get 8 people to do them as well as needing to be able to see the cutscenes for the story to make sense.

Thus, they were isolated, into their own little Roulette and given unskippable cutscenes along with a fairly hefty Roulette bonus to entice players into running them despite the awfulness that is actually running them. In order to keep the queues for them populated and without them being the annoying dungeon you get in other roulettes that many people would insta-leave from (Just like happens in other games that have terrible dungeons...)