Its interesting, considering just how messed up the Horde was in this expansion. While the Alliance (at least the NEs, the EK Alliance lost very little) may have lost more on a story front, the Horde lost far more on a Meta level. The damage to the character roster, Faction identity, and racial identities is absolutely insane … which will impact what few stories we get going forward.
By the end of BfA none of the architects of the War remain in the Horde. Even the War Profiteer Gallywix is gone. The only core racial leaders left from the 4th war are those two that are least antagonistic to the Alliance. The ARs were hapless passengers for much of these events. The Warchief position was dissolved and the central political authority has been rearranged. Remaining Sylvie loyalists are being rounded up in chains, Sira was returned without strings, and the Horde has committed to helping hunt down Sylvanas. On top of this, while nothing is concrete, the Horde seems unlikely to push the Ashenvale issue … and there is no discussion of Northern EK.
Like … this is a lot. Truly, it may not seem like it is to some Allies, but short of destroying the Faction itself (which mechanically you cannot do in this game, and narratively the Alliance was not in a position to do without great cost) … its a lot of steps in a very short amount of time.