I’m going to have to agree with Shieyra and Jellex on this one. The Horde players don’t have to play the Alliance side to know everything they worked at was undone. Marshal Valentine is killed in the Horde questing. In the Horde questing they find out that the Alliance somehow got the Abyssal Scepter back and were using it against the Horde at Nazmir. The Horde player helps Baine return Derek to Jaina. Sylvanas has Nathanos execute Zelling. Sylvanas intentionally has what remains of the Zandalari fleet sacrificed in the Nazjatar trap. Ashvale is a raid boss in The Eternal Palace. Horde players don’t have to do any Alliance content to see any of that.
However, none of that is relevant to or makes up for the burning of Teldrassil nor makes BfA somehow satisfying for the Night Elves, either.