I don’t like to have all of my subitems open at the same time as my main tasks. I would love a way to see on the main task how many of the subtasks have been completed - so I can get a good overview of the whole project.
Maybe an option is a way to connect the progress bar in the main task to the subitems subtasks (collectively). Hopefully that makes sense.
I love the feature of being able to see the checklist completion in a comment, and to have something similar with the subtasks would be great!