I might be on my own with this one, but Unholy Pact is boring as stones to play, and generally does not fit the feel of the class for DK, hell chains feels more of a Lock/ DH thing.
For dragonflight could we not have the DK artifact power back to get the empowered ghoul, which shares the model of rotface/ festergut from ICC.
Used to love that dude with his gas clouds, would feel way better aesthetically fulfilling the class identity along with the removal of the bland overtuned (compared to talents on the same row) unholy pact.
Edit: Spelling/ Typo