When thinking of the dreanei and the Sunwell... in my view that's a bit a of a sticky wicket as they say.
The naaru bent over backwards to redeem the blood elves. Even sacrificing one of their own so that the elves would return to the Light.
While about eighty percent of the draenei were wiped out on Draenor with little to no help from the naaru. In light of those two different events and the naaru effort in each of them, in my view, that's not something the dreanei want to think about too much.
Perhaps that's a good way to look at it as well, but also the acknowledgment of Velen himself that it was necessary, and the pushback of the Burning Legion (no matter how permanent or temporary it may be). Back one step with me then, ha. At any rate, it might just be difficult to fit in a place for this kind of event, as we only really get them about every month and a half or so (give or take) - in March it'd be tailed from Love is in the Air and closely followed by Noblegarden in early April, as Children's Week starts April 30th.