Why do we still have enmity?

[Legion88]

Technically, killing or not killing is also a binary value, yet you have lots of tools to manage how to kill more efficiently, and it could be the same for enmity. Healers and DPS should take enmity back from you if you don't put some effort into doing a proper "enmity" rotation.

Killing or not killing is not binary, living and death are binary. Killing is a process.
Also we are now at a point when we only have a enmity rotation, just like you seem to want it.

Also, the game loves for tanks to build ressources and spend those on skills, why don't use enmity for that ? This way, you'd have to manage how much enmity you're allowed to spend without losing the target.

Sure. If you can balance a tank with the enmity and a tank not having the enmity and if you can make the enmity and at least the enmity overflow quantifyable. Go for it. I would like this idea would bring a nice twist to the system.