I mean, the Broken Shore was a pretty pathetic display of power from both sides. Why not at least adopt Iron Horde technology?
If Garrosh were still around, we'd have a massive army, an arsenal of Gronn with cannons on their backs, massive juggernauts and siege weapons (ie: the one that destroyed the new dark portal in one shot), and an array of experimental tech from his goblin underlings (Blackfuse).
Just looking at the way the Legion forces were packed in on the broken shore, it just seems like a few Iron Stars would have wiped them out and breached the Tomb of Sargeras..
Surprised we didn't see Sylvanas using plague bombs too.