I get what you're saying, i'm saying that the highborne architecture is kaldorei architecture, it is not separate from non-highborne architecture. If you were to distinguish the architecture, you would base it along the lines of pre-sundering and long vigil, rather than kaldorei and highborne - because there is no kaldorei/highborne distinction in architecture.
The long vigil was not a building or civilization stage for the night elves, it was military world guardianship task they did to protect the world, partly out of their responsibility for attracting the legion.. The buildings are rurual kaldorei buildings, and it was the same type of buidlings they had for rural areas before the sundering.
And it is close to high elf architecture, in fact the high elves use the same rural buildings as the night elves - if you look at the Loch Modan Lodge, and the hinterlands lodge. Living in tree homes is very specific to rural druidic communities. Priests are either in camps with the sentinels or in temples.
Again, there is no modern Suramarian architecture.. Suramar was the jewel of the night elf empire, and wasn't changed at all during the few thousand years the night elves transitioned to this more night elven state we call nightborne, it's architecture is slightly unique, just as Eldre'thalas' architecture is, because it is designed to be that way, but it is still kaldorei and unchanged as you saw in the cinematic. The nightborne didn't change anything in that resource-limited bubble, those sticklers for tradition, as arrogant as they were would likely tell you "you don't change perfection" - and they don't regard the city as less nightborne because it was built as night elves...these people don't really divorce their kaldorei heritage in the manner the Thalassian elves did. They think kaldorie is the epitomy of existence, their noble and unequalled refined and intelligent beings - listen to Valtrois talk about her kaldorei roots in the WQ at Tel'anor, listen to Occuleth marvel and remember fondly the prayers to Elune in Flanaar temple when you do the withered training, Look at all the moon symbols, saber cats, kaldorei fanged mouths, stars and moon obsession they have - this is not a group rejecting their kaldorei heritage, but a group that considers itself fully within its right to have its legacy and culture preserved - at least until we free Suramar - because Thalyssra declares they will no longer suffer the stagnation of the past - which is why she is choosing Liadrin, the blood elves and the horde, because they'd continue in the same Kaldorei traditions if they stayed in the alliance.I'm saying that most of the Kaldorei Empire architecture obviously evolved into Modern Suramarian and Thalassian architectures. They have differences of course, but the main aesthetics are present.
So post 7.3.5 it might be a new identity emerging for the nightborne. However we don't know how that will turn out or look like. They could decide while they love the blood elves, the horde's ideals are not for them, or at least some of them decide them. Especially if we lose factions next expansion. if we don't they could still feel that way, or at least a good number of them and you have a divide - with some loving to embrace the blood elves nad the horde's ideals, while others never able to get over the slaughter of innocent kaldorie blood in Teldrassil showing in the horde, Burning Legion type mentality they fought against. This all however depends on blizzard and how far they wanna take it.
Thalassian architecture is Thalassian architecture, it would realistically have evolved in time, with the new foucses and changes of the high elves and their rejection of the night, stars and moon fixation of night elf kind (this includes nightborne). I would imagine earlier it would have resembled more th ekaldorei structures but became it's own aesthetic. Yet there would always be some degree of similarity as these are all elves.
Technically speaking the style isnt' new, i'ts just rural, and druids don't really build, most of them are in caves, it would be their families - I tend to label what you call modern kaldorei as druidic architecture for lack of a better term, as manipulating wood would be easier to achieve than hewing stone when arcane magic isn't present.Of Modern Kaldorei Aesthetics, ONLY the temple of the moon and surrounding called to the ancient Kaldorei asthetics; everything else the Kaldorei have built is on their new druidic style.
The absence of arcnae magic practice during the long vigil and the night elves commitment to it is why you have night elves not rebuilding old stuff, but if you look at the upgraded art, you find out that the buildings in the druidic community are sometimes wooden versions of the marble ones you see lying around.
But they're all kaldorei.
That would be narrative suicide, and I'd hate that. Darnassus shows you the nighte lves are not int he long vigil anymore, and for good reason. The period is very boring, nad if the current night elves never expanded beyond their long vigil identity, they'd be dead boring. This is why you have a city built in classic, and why you later have the kaldorei pre-sundering magic and cities also returning. This is how the night elves do civilization - put away for the long vigil, but returning afterwards.What I am saying, is that with Darnassus gone (thus with no need to be re-made to modern fidelity) that I'd like to see the Night Elves fully commit their splendor to their pagoda like wooden architecture, using even less old style classical buildings, because again, the Temple of the moon on Darnassus was just simply a throwback (It shared an archytectural style with the 10k year old ruins; it had no reason for it besides nostalgia)
Legion showed us how beautiful and polished the Modern Druidic style looks with modern graphics, what I want is the NE's in-universe to take that style into grandeur, truly moving away from the frankly highborne aesthetics.
This is why Darnassus buildings and temple are very much like the buildings of Zin'Azshari, Suramar, Nar'thalas, Eldre'thalas - with variations if you account for upgraded at - in that it is that night elf architecture updated and expanded in Azsuna, Suramar, and the other places when the upgrade happens.
The beautfy of the night elves it hat the forest elf element of the long vigil continues in the druidic communities and forests, when you look at Teldrassil, parts of Ashevnale, Val'sharah - these are forests you see the druid culture homes, the more rural settings of the kaldorei, but you also see cities and towns now, with Darnassus, then Suramar and ofc the images of Zin'Azshari, places like Tel'anor, Nar'thalas, Eldre'thalas
that's how nighte lves do cities, it is different to high elves - just compare Suramar and Silvermoon, but it also has a similarity. Just like when you look at night elves and high elves - they look different but also have lots of similarities. Until TBc the high elf was the exact same model as the night elf just with different colour skin and ears vertically up. The nightborne uses the night elf model slimmed down - with darker purple and the tips of the ears curving upwards instead of tapering. Ofc the nightborne is closer to the ngiht elf, but you can see the high elf and the night elf are more similar than they are different.
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that would be interesting for the void elves, or you could have the void dimension of SIlvermoon, you can entre, where everything is recoloured differently with void purples and gold, and certain variations if possible.
I would expect an architectural variation for the void elves on the normal Thalassian style that merges black empire or ethereal with thalassian for them. Blizzzard does like giving each sub-race an architecture of its own. Notice how Taunka architecture was slightly different from Mulgore Tauren, as was Highmountain.
See how kaldorei Eldre'thalas and Kaldorei Suramar architecture are slightly different from the main pre-sundering style of the empire you see in Zin'Azshari and the other (model updated) ruins. This is because one holds the shen'dralar and ogres, and the other holds the nightborne. So while night elven, they are given a slightly different look to allow for their future occupants, even though they were built that way in the pre-sundering era. Which is fine, no one expects every city to have the same identical look anyway.