We use lists to organize each sprint. In agile we can't possibly know yet the entirety of the contents for all future sprints or commit to dates for each task that might be very far in the future yet we need to hand out to our client a work plan for how future months would look like as dev sprints. Since there is the possibility to add start and finish dates to lists it would be very helpful if the Gantt or timeline view could show the expected duration of the lists even if they don't have added tasks yet.