Blizz honestly believes that Darkshore was 'revenge' for Teldrassil
https://www.wowhead.com/news=291733/...-with-blizzard
Shani began by saying that Tides of Vengeance gave the team its chance to “tell a little bit of Tyrande’s story” but that the focus in Nazjatar is going to shift to delve into other characters and to see more of what Sylvanas and Anduin are up to.
“I think she had her moment where we told some of her story and she got her revenge for the Night Elves. I don’t think we’re exploring her story too much more in Nazjatar though.” Shani said.
Morgan picked up the conversation. “The problem is there is so much to be told. Everyone has characters they want to expand on, but we also want to introduce new ones and to find ways to weave those stories together. With Rise of Azshara, the emphasis is on Sylvanas and Azshara herself. They are the focus. There’s just so much happening.”
And as wowhead's Perculia says
Blizzard in the interview describes her character arc in positive terms, noting she "got her revenge for the Night Elves." But did she really get her revenge?
It's not a particularly clear victory for Tyrande, as Darkshore remains a contested zone with no canonical winner, and we learned Sylvanas has the ability to raise Night Elves now. Perhaps we're meant to assume that the Horde retreated from Darkshore around the time of Dazar'alor, as Nathanos left Darkshore, but this is explicitly stated anywhere--and still leaves the Night Elves at a massive disadvantage after the Burning of Teldrassil.