How do you think blizzard will or should properly distinguish nightborne from night elves on a deeper level. I was thinking about them, and wondering more profound ways the two groups though similarly aged are different.
I must pause here to point out, that obvious things like advanced arcane city and arcane magic are really not what I'm thinking, those are superficial and not even accurate. For e.g. while night elves haven't lived in their civilization for millennia, they haven't forgotten how nor what they've learnt - we are told they didn't rebuild because doing so required the use of magic of the well they banned to prevent the legion returning. This actually give you an insight to the character of the post-sundering night elf.
THe nightborne are a representation of the pre-sundering night elf brought forward to the present age. The trapped in a bubble story is literally kaldorei pre-sundering culture preserved in a bubble. Blizzard wanted to bring a pristine night elf city and civilization to the present (they actually said that at Gamescom), and I for one prefer how they told the story as opposed to sending us back in time, or something worse like they were frozen/locked in a magic hibernation spell. It allowed a more in-depth and better story along with perks like a new appearance for night elves. (nightwell change, similar to void energy change void elves gets but with far less story background).
Anyway, the main differences between night elf and nightborne I think is pre-sundering elf versus post sundering night elf. For those of you who think it is arcane magic, it isn't, the lore has shown you night elves have already accepted arcane magic back in 4.0 (and never hated the source itself - something players confuse and is evidenced by their abundant use of moonwell waters from the well of eternity they hated magic abusers that caused this sundering and this state they are in (and you must realize if they hate this, then they must have loved thee wholeness and beauty their realm once had and it must annoy them they couldn't return to it - hence why abstaining from arcane magic use was a sacrifice - and another indicator of their nature). To better understand where they are now, you cannot ignore that he ban on usage though was lifted a few years ago you have to bear in mind, some really took eagerly to it. You have to factor this in seriously. The highborne are a group that are magically adept and progressed arcane wise over the last 10k years - the difference is not that nightborne are more advanced at magic necessarily - you only see the advancements of the nightborne because more art time development was given to showing you as they were part of the main expansion set, over the highborne in 4.0 who were a rush/small job in an expansion where the dragon aspects and the devastation of a cataclsym were the focus. Lore wise the night elves are greatly in need of the arcane and as of Legion, with the cure of addiction and final defeat of the legion, even though most reluctant have no reason to reject it. And while this doesn't mean everyone will flock to the arcane (those who are druids and priests won't give up their profession), the arcane is definitely back along with the highborne and a part of their society once more.
Night elves have arcane in their society, one of the differences from the nightborne is the measure of it. But it should not be the main difference. For those of you who haven't gathered this, amongst the night elves, magic is exclusively the domain of the highborne - meaning they handle it, develop it, and train - all who train with them become highborne in a similar manner to how Queen Azshara would pick the most gifted amongst the night elven populace at the arcane and elevate them to this social caste (you must bear in mind the highborne still operate in the pre-sundering culture similar to though porbably not as purely as the shal'dorei - again you cannot ignore this in your considerations). Pre-sundering, the arcane was a part of every facet of kaldorei society. This is so amongst the nightborne, but not the night elves as a whole. For kaldorei It is only like this amongst the highborne group. Thalyssra and co have not met the highborne yet. {From an in-universe perspective} the thought of all kaldorei being like Tyrande and the druids they met, with zero arcane presence and the prospect of potentially ( and i say potentially) have to explain and justify or encourage and promote use of this to people who don't see it (in your opinion) must have been or can be quite off putting and seem like a huge chore in comparison to a group like the blood elves and could be the reasoning behind blizzard giving her the line about stagnating and not feeling welcome. Thalyssra hasn't met the highborne yet, and well, the high elves are completely forgotten too.
The main difference I feel between night elf and nightborne is wisdom and maturity - Notice how Valewalker Farodin speaks or the druids of Val'sharah - they mention things like the folly of the elves, the lesson of humility that the nightborne did not learn as they didn't experience the aftermath of the sundering (but now have to due to the withering). This is where the profound distinction comes.
The nightborne don't have the depth of their kin. They've not had to lose as much or live so long without their comforts, this is what nearly undid them before the legion and why Elisande gave in rather than fight - this hardness is not in them yet, but they are getting there, Thalyssra experiencing the withering as Farodin predicted is the humility the nightborne needed to learn, the strength and wisdom to give up the nightwell is a clear result of proof that they are learning this (a very night elven trait and one that in the original story before the 7.1 modifications that started inserting the directional hints, was putting them firmly in the night elf camp) - something their younger blood elf cousins did not get as they kept their well despite the danger they were aware of (the narrative outright says many could not give up the arcane font amongst the blood elves). Look at one of the dreamer druids of Val'sharah in the BRH world quest say "In our more foolhardy days, we freely experimented with the arcane, <name> was brilliant, but has now been maddened by the foul magic that pervades this place" - this embodies the key difference, the profound one between night elf and nightborne - a nightborne would never say that although he may now think it, to consider those days the more foolhardy ones? Certainly not Elisande's calibre of nightborne, Thalyssra's on the other hand, I think are just beginning to understand.
I brainstormed a scenario with some fellow housemate wow fans of what the interaction between night elf and nightborne would be like if they were allies, based on 7.0 info (not 7.1), one of the things I came up with was the nightborne would really try to win their kin over to fully embrace the arcane as a good and necessary thing, and consider themselves to champion the cause of arcane restoration. But most night elves would look at them as though children as if to say, it's not the be all and end all - it's not necessary for a full and fulfilling live. It doesn't need to be a part of everything in our society like it once was, it's not an absolute need as we all once thought. For those who profess in it, let it continue to be all things to them, but it is not necessary for this to be the case for me (a druid) or me (a priest). However they did not become allies in the end. Still it leaves night elves with a very unique feel that's different from nightborne.
New night elf society characterized by harmony and balance - segregated orders pursuing their order's mandate to the fullest, but no longer feeling the need that everyone must experience the benefits of their progress. In time they will share together and learn together, pooling their knowledge together, this is what they have to relearn how to do again, from living so apart for so long, they find themselves together.
Nightborne don't have this problem ofc, already together, but they however do not have the serenitiy and tranquility nor stability of their kin, they are only just learning the full price of their hubris, and it will change them. They are not as hardened as the others, but war will toughen them up and just like their kin have everything it takes to be full and whole again, they have what it takes to weather the new storms they will face.