The point regarding the Eredar was that they could be retconned precisely because the story had not been nailed down in game. Now, because the story hadn't been nailed down in game, did that make the background for the Eredar expressed in the Warcraft manuals any less canon?
No. At one point, Eredar were always demons whose evil had corrupted Sargeras and all anyone arguing that point had to do was point at a primary source material to prove themselves right.
Yet as soon as Draenei were introduced into the game and that lore reinterpreted, Blizzard were stuck with it. While the theoretical authority exists for them to completely retcon this change and revert the story, in practice they cannot as the change would not only be too great, it would snap suspension of disbelief.
In regards to the Alliance High Elves, we have a slightly different scenario, in that everything said out of game is supported by everything said in game. Blood Elves clearly are High Elves, and so High Elves are playable. Alliance High Elves are a tiny group who only appear to play even a small role in the story when Dalaran appears. And the number of Alliance High Elves participating in the faction war...you can count them on one hand and you don't even need your thumb.
A group of Elves, living in a city that proclaims it's neutrality yet who have no loyalty to the Horde...so when will the Scryers get to become an Allied race? 'But they are just Blood Elves and Blood Elves are already playable!' is the response. A correct one too, the political neutrality of the Scryers is an irrelevant factor, and the fact they are identical to Blood Elves means making them an Allied race in their own right would be pointless.
Another group of Elves, living in a city that proclaims it's neutrality yet who have no loyalty to the Horde...well it's the Silver Covenant this time. And the one difference between this politically separate group of thalassian elves and the Scryers is that they express an affinity for the Alliance. But the same reasoning applies, they are not different enough to qualify as an Allied race when Blood Elves are playable.
So, once again, political differences are NOT enough to justify including what would be a duplicate of a major Horde race within the Alliance.
It's entirely the fault of the players if the players insist on seeing what they want to see. Nothing in game and nothing that has been said out of game are incongruous. Alliance High Elves are a tiny group of political exiles who congregate in Dalaran and who appear when Dalaran plays a role in the story, much as when we did Siege of Orgrimmar a lot of Orcs were involved. It matches the game world and is not meant to signal anything.
None of those are remotely comparable. The Paladin/Shaman division broke down because it was a bad idea that was unsustainable in the face of class development. The Horde's purple elf isn't a clone of the Alliance's purple elf, while a High Elf would be a clone of a Blood Elf (and this is in fact the entire problem) and the straight backed thing...that just sort of went away with new races and if it was ever a thing then I can't recall it from vanilla.
No, Afrasiabi was asked if something was possible, he said it was and you'll find most hypotheticals in a fantasy world are. I would also question the implication that the entire media was against Ion's response. I know Taliesin put out a video saying he had issues with it, but Bellular gaming had a brief comment in his roundup of that Q and A stating his agreement that Blood Elves are High Elves and that High Elves are playable.
Firstly, the movement is not big. It's several hundred people tops. The topics on any forum are always driven by the same people posting over and over and over again, as we do here. Secondly, as large as you think the demand for Alliance High Elves is, this idea that they are the most requested Allied race, I think it should be food for thought that if they ARE the most requested Allied race, then they are also the Allied race that faces the most opposition. As we know from that CM blue post regarding the thread locking that appeared a few weeks ago, the feedback from those opposed REALLY is listened to as well.
Frankly I would wager Blizzard feels they went as far as they could in giving the Alliance Void Elves and that anything they do in future will be Void Elf related.
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The number of High Elves actually within the Alliance has proven to be very, very small. They are not participating in the war. Their absence, and their long association with the now neutral city of Dalaran, strongly indicates that they are putting Dalaran first.
As in for not wanting to understand it...this strikes me as an unmeetable test. The only way I think you would accept I 'understood' it would be for me to end up agreeing with you, because clearly once you explain it and the person really gets it, all they could do is agree with the flawless logic.
It is entirely possible for someone to understand an opposing point of view and still find it completely, hopelessly wrong.
As I believe your community is.