Because our timesheets are populated with tasks which have got Planned Start or End date within the timesheet range, even thought you mark task as complete for yourself - it still appears on the timesheets due to dates.
It would be really useful if hitting 'Done With My Part' on tasks was taking the task away from your timesheets. Currently it's a pain as you don't really need a task t be on your timesheet if you are not working on it anymore. It's really annoying if you've got long list of project/tasks you work on,
