many people just assume that trass just forgot, or perhaps that they didn't fit into any update.
but I think I've found out the truth, as this is something that goes into the official lore itself
as yeeps, we almost all love horses, and as such, trass has gifted us not one, but TWO horse cosmetics to wear every single day
yet you never find a living, breathing horse in yeeps, just masks and badges to replicate them
this is because of one species, the lizards
these foul creatures overran the desert before yeeps had ever arrived, driving out the horse population residing there
it is also why one gnome points out that his horse is missing
now there is a solution to bring this mythical, and rare creatures back to their former glory, and that is to kill all of the lizards
if we band together as a community to slay hundreds, nay, thousands of these beasts, we may have a chance to see horses finally returned to yeeps, this time in the actual game as real creatures