>>96295017
>ignoring the meta culture war bait part of OP's post
Like other aspects of good design, a deep and intelligent RPG sourcebook isn't something you should notice unless you're interacting with it beyond a surface level. Your players almost certainly won't notice how the names of characters from each culture are constructed, the motivations behind background NPCs, the byzantine labyrinth of noble titles in the kingdom, or the hidden metaphysical properties of magic in the universe in a standard game; and a perfectly fine game can be had in a shallow pastiche of lazy tropes and stereotypes. However, things like the GM being able to casually reference hidden depth in the world, having the world change dynamically based in part on player actions, or being able to induce certain facts based on details the players observe often do make the game better for the players and make you as the GM feel smug af. Is that worth the time and effort it takes? I usually don't think so when doing my own prep, but if I'm paying real american dollars to buy someone else's RPG work it's not crazy to demand that they put in that level of effort and editing into it.