I've always argued Lyse suffered more from the poor writing around her character whereas she, herself, was reasonably consistent. It's still not great by any means but far less insufferable. Mary Sue Lamat is just that, a Mary Sue. There is not a single instance in the entirety of Dawntrail where she struggles. Sure, we're told about her insecurities but they never actually impede her. She just wants about them while everyone else, including our own character, praise and reassure her. It comes across as completely surface level just so the writer can argue she's not damn near perfect. The fact our character can't even give "..." answers like in previous expansion really highlights just how much the narrative wants you to like Wuk Lamat.
Heck, perhaps the best emphasis of that is when you unlock the EXs. The Wandering Minstrel, a character who usually champions us, outright says "Wuk Lamat and her companion." Literally every character, even small note ones, are made to wax poetics for this Mary Sue. It's absolute drivel.