Then you're probably looking for a more scifi isekai. As magic fantasy that does not take inspiration from the medieval requires alot of original ideas or research.
Now as for better written feudalism, how would you define that? As its a pretty large subject and narrowing it down would help future discussions.
Better defined feudalism, meaning that the story does not have a medieval setting for the sake of the medieval setting, but rather the author uses a understanding of feudalism to show how their world would work and how it can contribute to the story.
Here is an example how do you feel about arranged marriages, pretty awful right? Well a government that uses a feudal system would show that these marriages aren't only wanted they are encouraged, because with the marriage following stuff could with the marriage itself: a dowry, the intertwining of two families, potential bannermen and knights to help come to your aid, financial growth, political power, a way to move up the aristocracy, preserving the bloodline of a linage, new alliances and allies as well as enemies, etc.
And that is just marriage an author that implements a government is making a system of order in the story, and a government has defined rules, make no mistake I am not here to say I need to know every move of your version of the small council, but I am saying that your government especially feudalism or an aristocracy should shape the world with its' presence and not just be for decoration.
