There are 3 key things missing that makes it difficult to re-order/move/manage subtasks:
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Ability to re-order subtasks from List View, instead of having to open the Details sidebar
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Ability to drag tasks outside of main task and convert them into a main task from List View*.
(*You can do this by grabbing & dragging the subtask from the Details sidebar, but you should be able to it right from List View)
- Show at least 2 levels of subtasks in List View