Matchmaking without the Trinity: how would you do it?

[basketofseals]

There is a monk tank in WoW . In the single player FF games there never was a real holy trinity system. Steiner was in heavy armour(chose Steiner because he looks like a tank in "traditional MMOs) but he was my strongest damage dealer. They didn't "have" to make FFXIV into the trinity system :/.

Do you not realize the inherent flaw with comparing a single player RPG to an MMORPG?