Also, when did you ever see a daedra that feared death? No daedra run except scamps and they usually run to get distance to shoot you again.
If I may nitpick - from Spirit of the Daedra:
We do not die. We do not fear death.
Destroy the Body, and the Animus is cast into The Darkness. But the Animus returns.
But we are not all brave.
We feel pain, and fear it. We feel shame, and fear it. We feel loss, and fear it. We hate the Darkness, and fear it.
The Scamps have small thoughts, and cannot fear greatly.
The Vermai have no thoughts, and cannot fear.
The Dremora have deep thoughts, and must master fear to overcome it.
Destroy the Body, and the Animus is cast into The Darkness. But the Animus returns.
But we are not all brave.
We feel pain, and fear it. We feel shame, and fear it. We feel loss, and fear it. We hate the Darkness, and fear it.
The Scamps have small thoughts, and cannot fear greatly.
The Vermai have no thoughts, and cannot fear.
The Dremora have deep thoughts, and must master fear to overcome it.
I agree with your post, though, and for the purposes of gameplay, frightened Daedra are probably not something anyone would expect to see.