First off, I have to say I've read way more of these than I'd ever admit to my friends. The central tension always seems to come back to their public roles versus private selves. Braeburn's this folksy, open-hearted apple farmer, and Soarin's a Wonderbolt—Equestrian royalty, basically. A lot of writers play with the class difference angle, but it's less about money and more about social spheres. How does a small-town pony navigate the celebrity and protocol that comes with dating a national athlete? The fics that grab me are the ones where the conflict isn't melodrama, but quiet stuff: Braeburn waiting backstage at a gala feeling completely out of place, or Soarin struggling to relax and be 'just a pony' during a simple visit to Sweet Apple Acres.
Then there's the whole element of distance. Ponyville to Cloudsdale isn't a quick trot. That logistics problem creates a foundation for real, grounded stories about making time, missed connections, and the weight of constant goodbyes. It's a conflict built into their settings, and the best authors use it to explore commitment without needing some evil villain. The fics that lose me are when they invent a third-act breakup over nothing; the existing contrasts provide plenty of natural friction.