“Agile leaders lead teams, non-agile ones manage tasks. How many project managers spend hours detailing tasks into Microsoft Project and then spend more hours ticking off task completions? Unfortunately, many project managers like this task oriented-approach because it is concrete, definable, and completion seems finite. Leading teams, on the other hand, seems fuzzy, messy, undefinable, and never complete. So naturally some people gravitate to the easier – managing tasks.”
Reference: “Agile Project Management”, Jim Highsmith, Addison-Wesley, Second Edition