Zaroa, most of these had nothing to do with a novel set between Stormwind, Kul Tiras, and Zandalar. It would be like reading Shadows of The Horde and complaining that Vol’jin never went to Gnomregan to find out if it had been reclaimed yet. One novel can only cover so much, and naturally it will primarily cover issues revolving around the locations it is set within.
The novel itself does not make FlynnShaw and important plot point or anything over shadowing; the backlash and complaints on twitter/the forums, as well as the songs of praise, are what did. People’s responses are not something an author can control, and I will say again, Mathias Shaw and Flynn Fairwind are not the main characters of the book, and nor does their relationship overshadow any significant plot elements.
Why complain about Flynn and Mathias, and not Zekhan? Anduin? Those two characters take up far more of the narrative. If your issue is with the story being too character-driven, it baffles me why you choose to target the two with the least amount of presence as opposed to the two with far more.
Both are equally as important to creating a living and believable world. Madeline Roux is a writer with a background in horror, a genre that frequently focuses on characters and their personas - she wasn’t chosen at random, she was chosen because Blizzard knew what sort of book they wanted to sell and what she of all writers they had available is good at.
Worlds exist beyond the shattering cataclysmic events and the plot catalysts; they also need actual characters within them with motivations that make sense and personalities that keep them compelling. The fact that both of these stories exist for you shows that we are not trading one for the other; we are having both.