For unknown, but speculated reasons, the original writer left the team and so had to be replaced. There are two important things to note here. The first one is the fact that as far as we know, 0.5, "the raid patch" was the last one confirmed to be written only by the first writer. Everything afterwards is either a mix or solely done by the new one.
And two, Nomo, the artist is the one who wrote the story and designed the appearances and personalities of the characters all along, he just can't or doesn't want to write the text itself.
Now, in my personal opinion, the problem with the last two patches were rooted in the structure and not the writing or the story itself. Good counter examples are the Arena and the Horned god's night events. One event in one patch, from start to finish. Well structured, well written and coherent.
The Warchief's disappearance started an uproar in the camp, which is as of now left open, we instead went to investigate and start another thread with the bandits, which is also left open, and the 0.9 patch followed it up by setting up another 1-3 new threads of story and over a dozen h-scenes. Basically since the arena we haven't closed any narrative threads and the last two patches started way more new ones than what they advanced further.
When we read or watch a story, we enjoy episodes or chapters because those naturally mark points where you can stop for the day and feel satisfied. And these checkpoints seem to be missing from the recent updates.