Because the entire purpose of a roulette is providing queues for content you wouldn't otherwise do. No one wants to do Satasha or Solm Al but due to there being no ilvl requirement on Leveling Roulette, you have to deal with it. Meanwhile, queues take forever on the Ivalice raids which is precisely what the Roulette aims to avoid. So no, it isn't working as intended. This is simply an exploit the devs didn't think people would do.