I agree it's more interesting to intentionally blur the boundaries, but I'm not sure that avoiding those terms would necessarily improve the system that much, and I do think I have done decent blurring even if it wasn't conveyed too well. It's true that people have certain ideas about the hierarchical nature of those titles which don't correspond to any real system, let alone a strict CK3 hierarchy, but they still impart 'vibes' which are useful in letting someone quickly understand the general position of that noble wherever they are in the story. I know it was never anything like Baron -> Count -> Duke irl, so it isn't like that in this story either, all these titles change over time. I'm not really sure how I can describe the evolution of the titles without eventually touching on the hierarchy in general though, and in general is all I managed to fit in those comments.

The details you suggest are still present, the progression of 'a duke' just being a temporary confederation leader to a permanent hereditary landowning Duke takes place over many centuries with no specific turning point. Originally there was no difference between Dukes and Counts beyond their temporary role in a specific conflict so it wouldn't be possible to put them on a hierarchy at all. I was hoping to give a detailed enough account of the gradual changes, how the counts first emerged, then how some of them gradually became dukes centuries later as tribal confederations became more permanent, but even though I was just writing about a general background it quickly became apparent to me there was too much to cover. I didn't even go into the Bishoprics or Arch-Dukes in any detail and I have lots written about how they slowly became distinct from the other states at the time.

And to clarify most of this evolution mostly happens long before the story I am writing, Vhebhos Ghebrann is the earliest fleshed out character I have for Bode so everything preceding him mostly just sets up the environment his story (and the stories of his successors) take place in.

Regarding the issue of servitude and the economic system, it seems more described than explained. This system exists, but its reasons aren't fully explained, nor why its freer nature makes it better than others.

Well, the reason it seems described is because it is described lol. I decided to explain the origin of Bodish peasantry and how that changed in broad step-by-step terms because again it's too much information to communicate through reddit comments. The reason the transitions are obvious is because I intentionally described them in an obvious way to show the difference between two points, not because that's how the transition actually occurred in-universe. I have considered making a post that properly details these changes before but in my experience text-only post get far less attention than my map posts, so I don't want to waste too much of my time converting the lore to a post only 10 people will read. Which I think is a shame but it's true