Inhumans have always been a concept to grow from and experiment different things. I didn't like the War of Kings era because they were usually about staying out of conflicts, and what benefit did they have going from Earth to different empires to rule. It was what the Kree made them for, but they hated the Kree to an extent.
I found the universal inhumans concept and The War of the Four Cities interesting because it focused on them being a part of a large scale project and to go from proto-humans to an inter-galactic super species that would carry on the humans' seed. Hickman continued it with the X-Men. I question if the Krakoa concept, etc. was his original plan for inhumans.
I think the terrestial inhumans should be the main focus of the stories too, but it would be interesting to see the rituals they made on other planets and how they are parallels to other species, like the Badoon.