But this is just Blizzard's lore.
Two big named lore characters state that the populaces changed.
Now, in the current times - Night Elves have basically removed themselves from the Blood Elves and Nightborne.
Relations aren't good between them if Tyrande and Malfurion won't pass their blessing onto Lor'themar and Thalyssra.
It's just Blood Elves and Nightborne - otherwise, we enter into the realms of the ridiculous where people talk about Blood Elves on this thread and this is NOT where that sort of discussion should be held. The point of this entire thread is very clear and the Mods have also made it clear.