Communities occasionally fork... I participate on a slack channel that was a fork of the community on one of the chat rooms/channels on SE.
The codadict split was largely in part of (and I am intentionally being very vague here as if you dig it gets ugly and that doesn't need to be discussed here) a disagreement on the additional policies that moderators need to follow, religious laws ( https://en.wikipedia.org/wiki/Electricity_on_Shabbat ), SE management at the time, and the broad SE community consensus. To put it lightly, it is a mess. If you want to find an external source, Jon Ericson's one sided retrospective is a starting point.
It resulted in one of the more popular moderators leaving, joining a site/project in development and having a pull on the related communities to shift there.
Not involved in either community but I somehow don't think stackexchange's "make the answer ready to copy paste and don't link to external content" ethos applies well to creative writing.
The different Stack Exchange communities have very different ethos, and thus their answers have some very different vibes. In particular, the ones related to creative writing (especially https://worldbuilding.stackexchange.com/ ) are full of speculative and creative conversations that, while still constructed around the Question/Answers paradigm are not quite so draconianly managed as the technical Stack Exchanges.
I know I'm not the only one, but I sometimes get a bit distracted on SE/SO from the "hot network questions" sidebar and go down rabbit holes of reading answers to questions from different fields. People come up with a lot of interesting, thoughtful answers, especially in worldbuilding.
