This would also be helpful for grouping/filtering tasks on an analytics dashboard.

Also for disabled tasks: Just today I added an "[OLD]" prefix to all my old tasks, because I noticed it was difficult to find the start of the list of disabled tasks at the bottom of my task list (the difference between a black title and dark grey title is too subtle to notice while scrolling quickly through the task list)

This could be super usefull especially when you want to integrate some 3rd party services.