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ravenmoon , @
Combatbulter, @
formerShandalay
I think part of the confusion here is that the night elves have an emerging arcane community... but it's not a regular situation because they aren't new to the arcane, and are naturally talented at it, so these discussions get stuck between people talking about the night elves at different stages.
Right now, only their highborne have an arcane culture, not the whole society, - but it's led by incredibly powerful and ancient magi, so their knowledge base would likely be as advanced as the nightborne, but you won't see the fruits of that immediately - until blizzard show you, and their impact on the wider society would take a little longer.
Their history likely means the arcane-practice (not the same as the arcane) would never be society wide like before, but the arcane wielders would be ones their community would trust because they share similar values of responsibilty, benevolence, reverence for Elune and the wilds (like you saw in the Farondis highborne), even though their speciality is the arcane, which they are just as talented as their nightborne counterparts - the difference here is the invasion period highborne night elves stopped revering the wilds and harmony of nature on a societal level - and though some nightborne might become druids even and priestesses and have this attitude, it won't be a societal wide thing, just limited to their groups, whiles in the kaldorei it is societal wide, and it is the practice of arcane (not the arcane itself) that is not society wide.
The arcane though would always be a part of all night elves and play part as large and central to them as Elune or nature, and it always has, because all the night elves have always been surrounded with it whether they practiced it or banned it, they used the Well's properties, suffused by its energy they combine with nature to do good and Elune's blessings to prevent corruption and together avoid the addiction of the high elves - druids and priests do this just as proudly and unashamedly, they just don't practice the arcane. Arcane practice would be a highborne group only.
Synopsis
There is nothing to stop the highborne group developing night elven cities, influencing civilian life, forests been druid cultivated/fixed, led and influencing night elves who live in it more, and temples being priest led, and influencing night elves who live there too. - @
RangarDaz Night elves will have a city, it would be highborne built like the ancient ones (there is no point re-inventing the wheel - the assets are there in Suramar, narthalas, zin'azshari, Dire Maul - they would look like that, their temples would look like Cathedral of Eternal Night , and the other temples in the Broken isles, their forests end up looking like val'sharah, and all the various parts of their society would be involved. Traditionally, highborne and druids built the ancient cities together -- both these elements are present again, with the ancients form back then being around,a nd the shen'drlaar possibly the main group that did the Queen's wonders