I agree. By now, the reasons for rekindling the war between Horde and Alliance feel way to contrived. It was worn out by WotLK, tired by MoP, and it is going to feel even older by BfA.
It doesn't matter that champions of each faction managed to rally their peers regardless of race, faction, etc together proving that they are capable of understanding, and honor.
It doesn't matter that Sylvanas and Varyan were shooting the shit while fighting the Legion on the broken horde.
It doesn't matter that Garrosh killed Cairn. All the Tauren just went "whelps, guess he is the boss now".
It do