A tank being compulsory in an MMO? Who ever heard of that?

I don't believe that becuase people shy away from responsibility (i.e. they don't do it becauise they fear being kicked or whatever if someone dies) is a reason not to have a tank concept in an MMO. But the overall difficulty of playing this role needs to be lower to attract people to it. In FFXIV, tanks evolved from really being tanks in every sense to really just being a sturdier damage dealer. The biggest problem tanks face in this game is the enmity system which was never designed for the stats and scaling we now have, making the job far more difficult than it should be. But they've been really stubborn about this particular issue insisting th at they cna't just adjust the enemity cap and enmity gain rates (There really shouldn't be a cap at all- If a tank gets solid enough enmity they should be able to keep the monster's attention until either they or the monster dies)

But on the whole, for this specific content I don't think the problem is as mucha s you think it is. Usually a tank trust is "good enough," at least on E/VE as you say.