No subtasks?

Account type:US

I use tasks regularly and although it somewhat works for me, it is lacking quite a few features compared to other apps I have used. One of those that is REALLY needed is the ability to add a child task off the parent (subtask). There is just no other way I can see to be efficient and organized like I would like.

For example, tasks and subtasks might look like this:

Example:

[ ] Parent task
    [ ] Child task 1
    [ ] Child task 2
    [ ] Child task 3

Pretend that there is a check in Child task 2 box, which causes the strikeout to show that particular subtask, of the whole, is completed. When all tasks are complete (or perhaps even if all aren't) I could then check the parent task and that task would be "considered" complete - leaving possible child tasks incomplete. Sounds strange, but maybe my project changed and I didn't have to finish a subtask, or I didn't have time, but still need to mark the main task as being complete as it is going to be and still show what actually wasn't (no strikeout) if I ever had to go back and check. It and the child tasks would would then disappear from the screen (with a pending filter active) - just like what happens now with each completed task.

I could "kind of" do a workaround and use Sections as the Parent Task, but that would get so messy. Why not just allow subtasks like almost all other similar task apps do?