I am surprised that during Battle for Azeroth, Blizzard seemed to almost skate over the "elephant in the room". Remember in Mists of Pandaria, there was heavy discontent and internal tension from very early on, with lots of different leaders such as Baine and Vol'jin and even Sylvanas criticizing and resenting Garrosh Hellscream's policies and actions. Vol'jin himself went as far as threaten to literally shoot an arrow through Garrosh's heart, and that was long, long before Theramore and Pandaria.
But in Battle for Azeroth, right after the War of the Thorns and the night elf genocide, most of the Horde leaders and the Horde characters seemed to be fine with the Burning of Teldrassil and everything Sylvanas did.
Look how quickly Lor'themar and even Baine Bloodhoof (both of whom had ties with major Alliance characters) and most of the Horde military forces rushed to defend the Undercity at Sylvanas's command without commenting on Teldrassil or anything that just happened in Kalimdor.
Some Horde characters such as Rexxar became even
more hostile towards the Alliance during the war than before, not less, even vowing to kill Jaina herself, and most of the Horde army still continued to invade Kul Tiras and attack Stromgarde and fight in places such as Darkshore and Ashenvale against the night elves regardless, remaining loyal to Sylvanas. It is implied that even after Saurfang openly started his revolution, most of the Horde actually remained with Sylvanas (although most of their leaders might have gone with Saurfang).
So what did most of the Horde characters actually think about the Burning of Teldrassil, not just the major leaders and fighters, but for example, the average person in Orgrimmar, Thunder Bluff, Silvermoon and Suramar? What did most tauren and trolls and blood elves and nightborne think about what Sylvanas did? Were they celebratory, or upset, or mostly indifferent for the most part? Why did most Horde characters seem to reel at Garrosh's actions, but seem to openly support those of Sylvanas?