Design sprints are not a silver bullet.
If you’re careful in selecting the right project for your sprint, and you avoid some of the above traps, design sprints are a great way to solve 80% of the problem in a short amount of time. However the time and effort comes from designing the last 20%. It’s best not to see design sprints as some magic shortcut that can collapse the fabric of space and time, but as an efficient design approach to solve the bulk of the problem at an early stage, when the risks are at their lowest.
— Andy Budd, The Design Sprint hammer