Why do we still have enmity?

[Jandor]

Because you still need the tank to keep the mobs from killing your dps and healers....

That doesn't require enmity.

Enemies could just automatically attack the party member with the blue icon.

In two tank situations they could automatically attack the blue icon with the attack me button pressed.

I mean, that is essentially what we've got now, but enmity does still appear to technically exist as a "thing".