The devs make what sells, simple as that. If certain occult states from past games sold well, there's no doubt in my mind that they hadn't forgotten about them and are making them now. Occults like PlantSims, Werewolves, and Zombies weren't nearly as popular as the top winners of Vampires, Witches, and even Mermaids, so I doubt the less popular ones will ever be getting made in this version and fully expect the most popular ones to be remade in TS4 instead.