My Little Pony does not have interesting mythology. The fact is, the vast majority of its world and backstory are either heavily based on other stories or designed to fulfill a specific role. That doesn't need to be the case, but this is a children's program where most worldbuilding is made up during the scripting phase rather than taken from any grander vision, so the easiest route is simply transplanting ponies onto familiar stories from human mythology, or taking creatures from other fantasy stories and building a rudimentary, sometimes overly simplistic society around them.
With "Campfire Tales," the show seems interested in finally adding some weight to its mythos, and yet it falls into all the same traps. There are three stories in this episode, but all three are simple moral lessons which transplant human cultures onto Equestria without exploring them in much detail. Add in a framing story which tries to tie that to the actual main characters of the show, and you have an episode which can't do justice to either Equestria's past or present. It's still nice to see a diverse range of environments, and there's moments of charm and tension here and there, but it's not enough to make the episode particularly exciting.
With "Campfire Tales," the show seems interested in finally adding some weight to its mythos, and yet it falls into all the same traps. There are three stories in this episode, but all three are simple moral lessons which transplant human cultures onto Equestria without exploring them in much detail. Add in a framing story which tries to tie that to the actual main characters of the show, and you have an episode which can't do justice to either Equestria's past or present. It's still nice to see a diverse range of environments, and there's moments of charm and tension here and there, but it's not enough to make the episode particularly exciting.