I know "populism" is the boo word of the moment, but Truss is the opposite of a populist. (So is Kemi, who is much smarter than Truss, but still doesn't quite seem to get the point that politics is a retail business.)
Truss's basic ideological offer is that of the German FDP. Which has a certain constituency, but people who know Germany could have told her that constituency is 6% of the electorate on a good day.
Also, the Conservative membership is much less ideological than the Labour membership. It's quite common for candidate, either for leader or MP selection, to win on the "vibe" they project and turn out to be the opposite in office. The members seemed to like her Thatcher cosplay, but with her promising optimism and Sunak being downbeat, 57-43 was not a massive win with the members.
My starting point is that the 2019 Conservative electorate, once Brexit was done, wanted a government that would get a grip on immigration and do something about levelling up the left behind regions. It wasn't that ambitious an ask.
Matt Goodwin says he briefed Boris Johnson twice on what the polling said about who was voting for Boris and why. Boris wasn't interested. He thought the public were voting for him because he was just a charming and charismatic guy. That's why he was handed an electoral realignment and pissed it away without a thought.
Truss seems to have thought the 2019 election was a mandate for Singapore on Thames, the markets would be delighted to fund her turning Britain into Singapore on Thames, and the voters would love her for it.
Little to say about Kwasi except that he disproves the stereotype of Etonians being clever. As for Truss, her autobiography is some kind of weird psychological study of a woman who's unable to admit that she might ever have got anything wrong.
Dom Cummings always said she was crackers and shouldn't be allowed near power.
I also appreciate how quickly the Tories can assassinate a dud leader (looking at you, Labour MPs)