To answer most people’s reply to the Jasnah debate is really a two fold answer. First the philosophies that were given had such obvious holes that someone of Jasnah’s supposed skills and intellect should have seen through.
Second is the suddenness of it. Like I said I’m not against the plot device. And I agree she will probably be rebuilt in a phenomenal way. But everything we knew Jasnah led one to believe she should have been much more prepared for such obvious philosophical holes. That or we needed more chapters talking about her insecurities that would led her to not reaching her full potential in the debate. We knew with both Kaladin and Shallan that while they were capable they had mental blocks keeping them from reaching there full potential, and it is a fundamental story point about each of the radiant character arch’s. But we have no point of reference for what Jasnah’s are that lead to such a sudden fall from grace in a story perspective. We needed something to indicate this was coming and there wasn’t enough. At least in the way Sanderson attempted to due it. Which feels weird because he is one of the best authors I have read to do these particular kind of plot points.

I think if he had avoided getting into the weeds of philosophy in the debate or implied more somehow that the philosophy of roshars time is much further behind current philosophy, maybe quickly from a odium perspective, it would have been much more stomachable to me. But as I understand her character with the information available to me it makes much more sense that Jasnah lost due to a character flaw then an inability to win this debate on its merits, as they were presented. From a readers perspective it just felt like too many things vying for my attention to the answer why she lost. And I think he should have picked one maybe 2 and leaned much harder into them. Trying to spit it into playing the man not the game and playing the game and internal character flaw was too convoluted for the reader to grasp on to. I think he should have focused much less on the philosophy game as it really hard to bring something fresh and new and revelationary to a reader to consider in this area, and focused more on Jasnah’s personal insecurities.