While organizing my backlog and planning/prioritizing I often want to go through all the tasks I have and make sure everything is organized/assigned. To do that, I turn off subtasks. Even when I turn subtasks off though, they main task will still show up as greyed out, where the subtask is either referencing something or in “none” when it is not referencing anything.
There is a feature to “hide” subtasks right now, but it is more of a “collapse” subtasks rather than hide. It would be great to have a mode where subtasks are completely hidden/ignored.