Faulty analogy. You're not describing the rock's potential, you're describing civilization's potential. Romance is not a tool. You cannot do anything with a romance but present it as it is. And therein lies the problem with your analogy. Romances suck. They're like turds. You can Sugar coat them, or gold-plate them, but they'll still be turds.
And I'll say it again. Romance has a far bigger potential to ruin the RPG genre. It has already evolved enough to ruin Bioware games.
A lot of things can potentially ruin a game.
Combat, stats, story, presentation, graphics. Heck, even voice acting. Maybe we should ask Obsidian to remove any and everything that can has the potential to ruin PoE? Which you know, would be everything.
Romance is generally such a small part of the equation that it alone cannot ruin a game all by itself. If it some how manages to ruin it for you, then I think that's likely your problem, not ours.