So then...not nonexistent?
What did the Alliance have, again? Oh right. Genn's role in Stormheim.
Don't sit there and say Tyrande and Malfurion were Alliance story. They weren't. They were Druid stories. The Alliance wasn't there, I don't think Tyrande even references the Alliance or Horde by name (Especially after her dialogue was changed when Horde fans whined about her not being super nice to them).
Tyrande in 7.1 is an Alliance story, whose counterpart is Lady Liadrin. Who is acting as a Blood Elf/Horde leader and not a Paladin.
And then 7.2 we get the "our new leader becomes the leader" cinematic that we didn't get in 7.0.