I feel like a lot of it boils down to it being harder to go "well my personal interpritation of Wikipedia is X".
You see the same thing with the Fallout mod OWB. It similarly gives fans an overall direction, while still instructing them to "color within the lines" so to speak,, and because it's already a fictional setting you filter out a lot of the people that just want to write real-life political fanfiction, and keep only the handful of people that know how to adapt their autism to the setting, I don't know if "let's create a super computer that wants to create a perfect robocommunism" is someone's beliefs or not, but I don't care, because that feels like an appropriate plot for a Fallout game. On the flipside, "people in a political movement I like takes over a country and create an utopia" is always going to come off as literally that to most people, and that's why "historical" mods are ironically filled with a lot more half-baked fanfiction turned into quarter-baked gameplay.
Exceptions exist, I'm sure, but there are many good reasons why the Fallout and MLP mods don't get dragged through the dirt here or on the 4chan thread for that matter, compared to other mods. Honestly, I think that if the devs of mods like TNO and KR were just a smidge more capable of distancing themselves from their real life beliefs they'd be able to create better propaganda than what they currently art as most functional adults don't like being beaten over the head with blatant propaganda.