The house conflict in Dramione fics isn't really about Slytherin vs. Gryffindor for me anymore—it's about heritage. The interesting ones use the houses as a shorthand for the entire wizarding world's social baggage. Like, Hermione isn't just fighting Draco's prejudices; she's fighting centuries of pureblood tradition that Slytherin symbolically upholds. Hogwarts itself becomes this character, these stone walls soaked in old rivalries.
A lot of post-war fics do this thing where the castle is being physically repaired, and that mirrors the relationship. They'll be stuck in some ruined corridor together, and the house colors on a torn tapestry are literally blending. It's heavy-handed symbolism, but I eat it up. The conflict gets externalized into the environment, which is smarter than just having them snipe about house points.
The weaker fics, though, reduce it to 'Gryffindors are brave, Slytherins are cunning' and make their romance about combining those traits. That feels like a missed opportunity. The real tension comes from Hermione grappling with the fact that the institution she loves—Hogwarts, Gryffindor—is part of the system that allowed Voldemort to rise. Draco represents the ugly foundation she never had to see from the Gryffindor tower. That's way more compelling than quidditch rivalry.