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Mace, I think the night elven highborne might be better served as a group that genuinely seeks to pioneer the re-unification of the elves but from the kaldorei pricnipalled standpoint. Hence why they're allied with the Darnassians.
I think they'd have been better served as identifiably a separate group from the Darnassians, like the Illidari and the Ebon blade, but allied to them - and it is clear it is an alliance, not a re-integration.
So they seek to restore the confidence and proliferation of the arcane amongst the largest kaldorei community - i.e. the Darnassians, by restoring its confidence in magic and restoring the pride and integrity of the highborne class (no they shouldn't be choosing easy targets, they were the empire leaders and were "glorious" , the Queen's over reaching (which this Highborne group did not approve of, ruined it all). And as such sort of act like a go-between.
I think the Nightborne would have been perfect as that Illidari/Ebon blade type group, with the Highborne working with them for htis elven unification but operating amongst the night elves while the other Nightborne working with the blood elves.
Blizz could potentially have ended Suramar as a place where both Highborne and Nightborne now live and work together, with the Highborne working amongst the alliance and the Nightborne amongst the horde. Keeping the Thalassians separate in Eastern Kingdom and the Darnassians separate in Kalimdor.
This way there is a separation, just like when you think Illidari, you clearly don't think Darnassian druids/priests, nor when you roll a Night elf DK do you think Tyrande/Malfurion, you think Ebon Blade, it fits far better if you were led the same way to think about the Highborne.
I would propose. The Highborne have been working closely with the broken isle elves, who are quite friendly with the Nightborne - despite the nightborne being on the horde - this is possible because the broken isle native night elves are not alliance elves and haven't been involved with the faction politics at all, not to mention they play a key role in the salvation of the Nightborne through the Arcan'dor and the resistance in Shal'aran before the elven armies showed up, and they were counted in the Nightborne group despite being kaldorei.
The elves of the broken isle are the ones that seek elven integration and restoration of the fortunes of the elves. This goes well beyond vanity ofc, because the elves are on the verge of extinction, the younger races keep making rash, unwise decisions, and they easily feel that the elves as one really did things the best way. They seek to lead by example, and possibly influence the factions.
Part of their goals are to reconcile the Darnassians and Thalassians, but also to chaperone /watch and advise with wisdom horde and alliance.
I just think this plan allows the Nightborne and Highborne to have joint role without involving all the night elves and blood elves and instantly resolving their issues, they could be a new power duo repreesnting the ancient kaldorei as joint effort group working to influence and uinte their brethren, winning some support amongst both Darnassians and Thalassians but obviously resistance as well, and that storyline can play out over time.
Meanwhile practically, this could come with some extra highborne specific cusotmisations for Night elves, and some additional night elf influenced options for Nightborne.
Things like the star tattoos and hair etc for night elves, and some more hairstyles, colours and arcane effects for nightborne.
If they did this, and you clicked Highborne, maybe you would start with a different narrative or an NPC saying something like you've just come from the group that went to the Broken Isles, and you are back to help the Darnassiasns and restore the trust of the kaldorei in their ancient heritage.
Would that work for you guys?