I see SE just wanted to show more areas of the Middle Lands. I think it's worth not seeing highlands with a bunch of fortresses for something newer. All the other reintroduced areas are tied to important nearby landmarks(either a nation or a beastmen stronghold). Garliage simply had to make a return, so I guess that's an excuse for the other two dungeons as well.
Elmer, great job as always.
This proves that just because Bastok has guns, it doesn't mean battles are that straight forward. What they needed most to prevail was a great tactician.