I think that saying "when you author the scene and then put the pen down for the player's to pick up, you've written the start of something" is probably valid? If I write down "Will they gain the Spirit of the Gwead's favor?" and said spirit has said "if you want my favor you must seal away the disturbance in my barrow-seal that your kith have undone" and then flesh out the Barrow of King Cothain that's been fractured by looters... there's a story there waiting to be told even if we still have yet to tell it together.
Sure, they can pass by (and answer the question with a "no" or find another way maybe), but if they take that up...
Sure, they can pass by (and answer the question with a "no" or find another way maybe), but if they take that up...