Horde isnt orcs but lore-wise they are the most populous race, along the taurens and trolls, the leader should be someone who defends the interests and ideals of the majority of the Horde, ideal ones that were the reason for the races unite
Warchief is a orc title and should always be, like the high king of alliance should always be human( funny blizzard not trying to put a gnome as high king, the only like to fuck the horde leadership
) those races are the main reason the war still goes on, like back in cataclysm Garrosh was furious riding humans from Kalindor, now they are trying to remake the scenario with some forsaken-worgen thing, but surprise there are no need for sylvannas be warchief to do this
Saying there are no better person for the job is simple Wrong