Since the game started and I received my first horse I always wondered why different breeds of horses didn't have subtle gameplay differences... even if it were just in the stats, like a palamino is always +10 to speed while an Imperial horse is always +10 to stamina. Eventually when new mount types came out the idea stuck with me, it seemed like the mounts should be more than just skins.
Example:
Horses maintain sprint speed without using stamina
Cats gain a longer jump distance
Guar can carry more equipment innately
Wolves have a reduced agro radius
Dwemer have infinite stamina but no sprint (i.e. you cant be knocked off)
I know it isn't high priority or anything... it just seems like a missed opportunity to add some variety in mount choices.
Kode Darkstar, Aldmeri Dominion