Yeah. As others have pointed out, leveling roulette isn't a true roulette. There is almost always going to be a least one player who has queued for a specific duty and the roulette will match the other players with them. There will almost always be a player leveling a new job, or making their way through the MSQ. The latter is more likely to use the duty support feature though as it allows for a more immersive experience with the story.

The only way for it to truly be a roulette would require all four players in the queue to be at level cap and utilizing the leveling roulette feature.