Racial mounts of WoW reputation information

By level 50, you could manage to become Exalted with Ironforge, Stormwind, Darnassus and Exodar. Stormwind was probably the easiest, followed by Darnassus. You had to very little out of the way questing to become Exalted. For the most part, you just need to follow the low level quests in the area and get some of the splash over from Alliance quests. You are likely to become Exalted with Stormwind or Darnassus by level 30. Exodar is the only faction you could have to do cloth turn-ins for. Gnomeregan will be a little more painful, but you are a Gnome so you are not too worried.

It's possible the reason they don't let tauren have some of the smaller mounts is because of doorways. Trolls on raptors used to get stuck in doorways and the Raven Lord gets stuck in doorways, especially in UC. A tauren on a hawkstrider would need to have a bigger hawkstrider and therefore be even taller and wider and maybe get stuck in even more doorways. And then people would QQ to Blizzard about fixing this. How they stopped trolls/raptors getting stuck in some UC doorways, but you don't know if it's just a few lines of code, or if they would actually have to change the in-game environment. Whatever it is, maybe the tauren mount issue is merely just them avoiding having to do that.