If interacting with others to engage in roleplay is this horribly terrifying thing to so many, a lack of a serviceable Horde-exclusive hub might just be the least of any of this realm’s worries.
I remember when the Crossroads was a thing! It was running for at least a few months, but then it started losing steam; and not because of a lack of support.
Everyone in Horde was clamoring for something like it, and then, when it popped up, as I observed from a lot of folks (but not all of them), showed up and interacted with nobody but the one or two friends they brought along, retreating away from any attempt of interaction from anybody else, sometimes even going as far as to only speak and emote with each other in party / raid chat.
Eventually, the folks who did try to go out of their way to interact with others tired of talking to walls, and slowly dripped to other places, even if a fully serviceable roleplay hub existed in theory - as in practice, it did not, because a lot of you used it as a backdrop for private roleplay, and not as a true public roleplay hub.
So, no. Random Horde RP and unguilded Horde RP absolutely exists. I know it because it’s the only source of roleplay I had for over 2-3 years in my time in Argent Dawn, and it was fantastic - and for most of that time, Orgrimmar was dead, and the Crossroads Hub didn’t exist.
I can count the Argent Dawn discord groups I’ve joined in the span of five years with one hand, and I’d still have fingers to spare from my other hand to count the days where I did not get to roleplay on Horde side while actively looking for it.
Roleplay is only non-existant when the very idea of interacting with other people to roleplay with them is seen as an obstacle to be removed, and not the very concept of what roleplaying is.
If you see roleplaying as a means to write at an audience, and not as a means to write with fellow writers, you might have to reconsider if a lack of a perceived fix-it-all walk-up roleplay hub is really what’s hindering you from finding roleplay.