It really feels like the shoehorned all the savage horde races to fit into the other covenants, which all fell "human, undead or elven" themed.
Nothing anchestral or maybe "zen" themed (for Pandarens). There are races and characters which perfectly fit into the theme of all the covenants and then there are characters which don't fit into most of the covenants at all.
I mean the Tauren talk with the ghosts of their anchestors all the time. How does this work with the whole Shadowland theme? Do shamanistic anchestral souls remain on Azeroth instead of going into the Shadowlands? But in the end I have the feeling Blizzard doesn't really care about Tauren lore at all. Tauren never really play an important role in the story (other than Baine).