Sprints are effective for delegation. It is a way to communicate what to work on, the order and how long tasks are expected to take. If a tool like JIRA is used more systematically, we can just document and communicate many things thru it.

Plus we get a statistical sense of progress after a few sprints. Some people prefer visuals like Gantt charts.

It is best to encourage individuals to plan their tasks in a tool. Some tool is critical to a sprint, it is a way to get some writing reps also. Others can read and provide feedback. Post-its on walls is not effective sprint planning.