The thing I don't get is I don't feel the character's personality changed between being Yda and admitting she was Lyse. What you're saying would make more sense if she was a serious leader who'd been pretending to be ditzy because she was impersonating her sister, but I read it in reverse that the Sharlyan scholar was acting ditzy because she was really her younger sister the whole time. I think that lack of change in her personality was why so many objected to her becoming a world leader at the time.

Was 1.0 Yda less ditzy?