Unukalhai is literally involved in those role quests and he MOVES to the Crystarium after doing the Shadowbringers Void Quests.(Case in point, Unukalhai, an entirely optional and missable NPC from Heavensward, has new dialogue after you completed the role quests in ShB. I have no idea if they updated him and Cylva post EW void excursion.)
Also he does.
In The Crystarium, after completion of Buried Memory and Shadowed Pasts (the first of the 2 hecteyes quests)
What? With our methods, we can barely maintain a faint connection to the Thirteenth...but you say that you've journeyed there!? Incredible... Such drive Archon Y'shtola must have to uncover the secrets of cross-rift travel. And to conceive of creating an artificial Atomos could only be described as inspired. Suffice it to say, I should like nothing more than to join you on your future forays, but I will abide in patience for now. You already have a capable guide at your disposal, and my presence would be extraneous. Besides, there are certain tasks that require me to be here in the First. For one, I wish to learn more about the approach used to revive the Empty. 'Tis my hope that the selfsame can be applied in the Thirteenth, and to that end, I have arranged to meet with those involved.
They usually don't touch NPCs that aren't involved in quests. That's a generic NPC, Unukalhai is a Lore NPC.Maybe it was a harbinger of things to come.