I mean they changed the doodads and I'm pretty sure some of the Forsaken assets there are exclusive to that one scenario. As for Light users, is that canonical or just gameplay convenience? We know they have major issues with the Light because of Yrel and company. Now the Shamans being in a place where the elements were tortured is an iffy point, but for civilians it'd really vary. Blackrocks are fine with living underground, Warsongs and Thunderlords probably less so.
This kind of thread annoys me because there's so much they can do with the Mag'har just internally, let alone in the context of the larger Horde.