I just find it odd that novels are being released that deliberately ignore the current novel continuity (note I don't say canon !) when they could easily be written to 'fit in'.
Because continuity isn't the reason we tell stories. We tell stories to explore interesting ideas. It can be interesting to explore an evolving, interconnected continuity, but the continuity is a means to that end, not an end in itself. If someone has a great idea for a story that can't fit with that continuity, they shouldn't be forbidden to tell it.
could not have been written to fit the main novel continuity. Its storyline contains elements that take the characters and their lives in very different directions than what the other novels have done. It's a huge, epic, sweeping story, and its author and editor decided that it needed the freedom to strike its own course -- grounded in canon, of course, but otherwise not held back by anything else. It's what the story needed, and that's the priority.