Do your project schedules ever change? If the answer is not always yes then its absolutely yes! Depending on your team, the PM will either be responsible for manually rescheduling tasks or automatically reschedule tasks, PI allows for both.
Delay Task until Predecessors are Marked Complete
Enable the features under the Project Options down to the Task Auto-Rescheduling Options.
By default, tasks will not auto-reschedule, but to change that, you can click on the drop down for the Auto-Rescheduling Type and select Delay Task until Predecessors are Marked Complete.