Hello there! First, this is about players rolling not NPCS. Second, i already let them decide what to do with successes and advantages in combat and 'non-story-related' rolls, like searching for random supplies.
What really bugs me is how to deal it when story relevant npcs are being questioned. My urge is to simple take over. How do you deal with it?
Ps.: I started letting them decide what to do with both advantages and threats but they decided to let the threats and failures to me.