Why do we still have enmity?

[Argyle_Darkheart]

[Enmity is] either something you completely ignore (As it is just passively applied in copious amounts), or something you spend every single second spamming out.

That's simply not true; you yourself even say as much earlier in your post.

Now, I'm not saying that enmity management is currently all that interesting, but it doesn't fit into either of the two extremes you've outlined.