As the title says, I think the Nightborne could benefit from further attention.
My biggest issue is their racial magic damage bonus. By having their race’s tiny stat buff tied specifically to magic damage, it can easily feel like you’re making the “wrong” choice if you want to go with a physical class or spec (warrior, outlaw rogue, hunter, etc.).
Should it prevent people from playing the class & race combination they want? No.
Will it? I can easily see it happening.
Also, the mailbox sucks pretty bad. Especially since a whole new wave of people are getting mounts with mailboxes and it’s not hard to get a toy that can summon a mailbox.