Back when FANDOM was migrating the wiki domains, wikis that focused on ""more serious topics"" would instead have their domains changed to wikia.org rather than fandom.com.
It would have been fine if they stopped there, but apparently core features FANDOM added years ago such as Discussions, Comments, Message Wall, and much more are not present on wikia.org wikis.
I don't think the wikis having more serious topics is an excuse for FANDOM to disable such features on them. Or is it simply the case that a majority of these wikis have just disabled these features themselves?