Casual matchmaking has a hidden MMR, not on a per-job basis, and the system just tries to attempt to balance the overall average on each team?

I’m new to pvp so I barely know what I’m doing, and just playing casual matches of CC. If I play tank or melee dps then so far I have to get lucky to have a match where I actually contribute to the team instead of just dying a lot, and I don’t mind that since the game is still fun/interesting. But it’s a little silly and unfun when I play Black Mage and safely get a lot of kills/assists by just standing back and shooting people during a teamfights, and I’m more likely to win matches when playing it. Per-job MMR would be nice to have if we actually don’t have it already.