Imagine making a dinner with all sorts of finely diced vegetables, but before starting any cutting, you realize someone has stolen all of your forks! Looking around frantically, they are nowhere to be found, but there are a bunch of old sets of chopsticks leftover from various Chinese takeaway dinners.
Knowing the chopsticks will be the utensil, it’s likely the vegetables will be easier to eat sliced rather than diced because they will be easier to pick up. So an adjustment to the recipe is in order.
Thinking about the downstream interaction is a way to make life more convenient for everyone. It’s also the reason to put your product idea out there, so that your audience can tell you, “Your dish tastes great, but it’s a pain because it’s finely diced and we only have chopsticks.”