Now there is a specific group of unplayable elves on Alliance that call themselves High Elves. At times when I see people making counter arguments to adding High Elves to the Alliance by stating that race is already playable through Blood Elves on Horde - this is a red herring (fallacy).
It's a red herring because what is being asked for in the discussion is a specific group identifying themselves as High Elves (which just happens to also be the name of their race - thanks Blizzard

) that exist to this day and since release of WoW on the Alliance.
- If Blizzard had decided that group's name were Silver Elves or Human thot Elves or w/e you want to fancy then this same specific group would continue being asked for, and why is this,
why for instance aren't there tons of Ogre for Horde discussion?
It's because Blizzard continues to put this group of elves in the Alliance faction and Alliance players' face. Serious about this one. There wouldn't be as strong as push for "High Elves" throughout the years had Blizzard not increased their visibility in the Alliance for as long as they've done and continue to do today.
- We learn even recently here about how Island expedition teams are made of members of the opposing faction:
All of Horde's Island expedition teams do not contain any faction of a race that is unplayable by Horde players. Alliance's does. It contains a High Elf NPC - which is said to be a member of the Alliance as per Jeremy Feasel.
So what do we have?
- A group on Alliance that calls themselves High Elves
- Blizzard continually showing this group fighting for/alongside Alliance
- Blizzard adding more and more of this group among the Alliance
It should then not be a surprise why this request has been longstanding as it has for the lifetime of WoW's existence. And it's a red herring when people try to try to say "you can't have this race because we have it and its ours" when it's always been about 1) the group and 2) this group has existed on Alliance before Blood Elves were enrolled into the Horde.
And as a special point, the Blood Elf race is now available to both Alliance and Horde at this point anyway. This never stopped the High Elf requests, in fact it seems to have fueled them more. At this point if it's truly confusing for you to understand that what is being asked for is a "faction" of a race and not the race itself then please look to the example of how there are multiple types of Humans (Stormwind, Gilnean, Kul'Tiran, Undead) to see clearer what is meant. Forsaken are DEAD Humans but still Humans nonetheless.