You forget how a particular todo list item relates to your main goal
Managing a flowchart version of your todo list requires too much effort
You want a thorough to do list but you don't want to be overwhelmed by it
You create a new todo list when your previous to do list turns stale - you've grown tired of the cycle - perhaps you don't plan as much anymore
Reflecting on your thoughts is hard because your thoughts are scattered. You need some kind of structure. But the structure you have requires too much effort to maintain
Ready to see to structure your thoughts with hierarchical diagrams?