I’d love to see a feature that indicates whether an item is a subtask within the Home Page “My Tasks” widget 
My team and I primarily work from this view, and it can be surprisingly hard to tell what’s a subtask vs. a standalone task. A lot of subtasks have similar or vague names, and they only really make sense in the context of their parent task 
Adding something like the “<Parent Task Name” reference used in the standard “My Tasks” view would make this instantly clearer and save time every day 
Small change, big usability win.