I like the store metaphor.

Shopping list is set and I should be in and out in 15 mins but it turns out there is no ketchup - so do I go to another store to get ketchup or mustard will do. Product owner my Girlfriend has to decide because she is doing the cooking and will present it to customers our guests, and she knows if they like mustard or not because she talks to them more often than I do.

But yeah going to another store might make dinner late and I cannot know this until I actually arrive at the store that there is no ketchup on the shelves.