So...
Kil'Jaeden mythic doesn't award any mount at all.
Yet Blizzard had
this model ready to deliver, and decided to instead sell it.
...
Let me get this straight: you accept the challenge and play the game to the highest level. Invest tons of hours gearing up, perfecting gameplay, farming, progressing. It takes a lot of dedication to climb this mountain and clear a mythic raid. Specially bosses like Avatar and KJ. Everything in the game converges to this challenge, that is clearing the last boss on the highest difficulty.
You finally do it and, unlike Yogg0, Lich King25H, RagnarosH, etc, you get nothing from freaking Kil'Jaeden, one of the most important figures in the history of WoW.
And there was a really good looking mount, with a somewhat draenic flavor, that was just ready to go to shop.
Come on, guys.
And people to this day insist that it wasn't cancer putting a mount shop on a game you pay for retail, for expansions AND A MONTHLY FEE.
When they introduced this shop at the end of wotlk there was outrage, but ofc white knights would defend it as "fine", "acceptable business model", "won't affect quality mounts being released outside shop", etc.
If Wotlk was today Mimiron's Head would be a shop mount.