Chaosmancer
Legend
While certainly many societies don't need and will not have "hard" slavery, I'm not sure there's such a thing as a "good" kingdom in a moral sense. Every polity is looking out for their own self-interest, and from a modern perspective (which I assume you are coming from here), any literal kingdom is going to be termed as "problematic" in some ways.
Was there a point to pivoting to "there is no such thing as a good kingdom" while also saying that I'm right that slavery isn't needed? Or is that just a subtle way of going "well, they are all bad anyways, so how they are bad doesn't matter?"
This is why I don't look at these things from a modern perspective unless the issue in question is a moral issue for my players (ie, I or they can't stomach the presence of an element, which is an issue in a few places) or a practical issue at the table (some degree of abstraction is needed for viable play). And of course, we all draw our own lines for this stuff.
Yeah, and some lines end up being that the GM and players... would prefer to look at things from a modern perspective to make sure that their fantasy worlds they made up for fun are actually fun to exist in for those players and GMs.