I agree broadly, but I will play devils advocate there, I think it currently suits Blizzard to have ‘Enemy Troll’ races, and the Farakki have only ever much pretty been enemies of both Horde and Alliance. Similar (But not the same as) the Amani, who -were- allies of the Horde during WC2, but not since, and are now firmly enemies of not only the Horde and Alliance, but even other Trolls (Hence them being hostile in their enclave in Dazar’Alor (No, I have no idea why the Zandalari let them in, in the first place, they will happily kick off on Zandalari player characters.)
Some Farraki maybe, but not all. After all, they would be falling under ‘Darkspear’ as their generic ‘race’ in the same way as Wildhammer fall under ‘Dwarf’ (Though not Dark Iron’s).
A Cinematic would imply they were an Allied Race, which they have not done for Wildhammer, or for that matter, for Void Elves looking like High Elves. Thing is, they have no established presence in the Horde, unlike the Wildhammer and High Elves do in the Alliance, which means they very much would be falling under Rok’han as head of the Darkspear, which is…kinda where they are now?
I agree, some lore clarification would be nice, to explain how -some- Farraki found themselves to be under Rok’han’s command in the Horde, as until then their status would be nebulous in the extreme.
Paradoxically, the one Skin that Trolls didn’t get, that actually has an established presence already in game would be the Revantusk. I mean, Sure, the Amani are enemies, but the Revantusk are part of the Horde, have their own settlement, and have their own leaders there. That would have struck me as a no-brainer.