Dialogue change on raid completion?

Is this already a thing? I don't think it's a thing.

I understand that it is mechanically impossible to change enemies or the map on quest completion since, for one, those are not per-player, but I think NPC dialogue could probably be changed if you've beaten raids? I think some of the TCC people have stuff to say about TCC being finished but maybe that's just the Fest NPCs. Pretty sure that, at least, like, the Olux people could have things to say about the lack of Grootslangs + the Decay weakening.