Originally Posted by
Raisei
It's a clear indication. Only characters important for the main story got the high-def models. And the main story was between Saurfang and Sylvanas, the Alliance was there to watch and do nothing after again serving as a punching bag for the Horde.
Varian simply felt that everyone had a right to a piece of Garrosh, not just Thrall (who had caused the entire mess in the first place), he never intended to spare him.
I did talk about Legion, can't help if you only read halve the post.
Vanilla had no overarching story to speak off, Wrath was the result of a former Orc Warchief manipulating and corrupting a human and BC ... fine guess that one is on the Alliance with Illidan (not that he ever was a part of it, but fine).
Just note how many times the word "Warchief" crops up when you look at the expansion main stories. Wrath, MoP, WoD, Legion and BFA are all either the result of the actions of a Warchief or have them in the role of the antagonist directly.