I think the Arathi Warfront was intended as a setup for further Warfronts in the Eastern Kingdoms with the canonical alliance victory leading to more campaigns/warfronts in the northern Eastern Kingdoms like the Silvermoon Warfront (and possibly a Gilneas one), similiar idea with the Darkshore one leading to the Alliance attempting to reclaim/conquer more of Kalimdor with the Barrens and Azshara warfronts (and possibly and Echo Isle one)
Since more Warfronts didn't happen the Arathi one does feel kind of pointless/nostalgia baiting with the Humans vs Orcs thing (aside from Stromgarde now being a Kingdom again which is neat)
I do agree it would have been interesting to see the Void Elves get more development with a Warfront about them trying to take Silvermoon especially if the Lightforged were their support/backup since currently it seems awkward that we have the Light Infused Draenei and the Void Infused Elves on the same factions with seemingly no problems with eachother (maybe the Lightforged wouldn't trust them with something as important/holy to the light as the Sunwell and would only be helping them in the Warfront to make sure they don't do anything shady with it or maybe they would only be doing it begrudgingly since Turalyon ordered them to support Alleria's forces.)