There are seldomly only one way to reach important goals, and we have to be able to re-evaluate what we need to do as the project moves along, rather then being stuck in whatever we added to Trello/JIRA when we started off.
Break It Down allows us to visualize different possible paths to success and use our spatial intelligence to better reason about what needs to be done and when.
End up with concise TODO lists which include exactly what needs to be done to achieve high level goals and reach milestones along the way.
Using Break It Down is as simple as writing down our goals and milestones and under each one list what needs to be done. Move tasks around, copy-paste, remove something, add something, it's all in the text.