>>5851012I personally use opposed DCs on a few occasions to take the burden of deciding the DC off of my own shoulders. Plus if you're mathematically minded, you can usually figure out what a DC roughly correlates to in actual difficulty, so opposed DCs prevent the QM from railroading a bit and let some rolls be super easy or hard. Maybe I just err on the side of caution but I've never actually had players fail a roll prompt I've given, so a random opposed roll actually gives them a chance to fail and have a setback.