There’s a little drop-down arrow that normally shows up to the left of the task name in projects. You can click this arrow to expand all the subtasks without needing to click into the task.
It would be great to have this same UI on the My Tasks page.
This is useful for working through a list of subtasks quickly, where you can have the subtasks open on the left of your screen and then the details open on the right.
The alternative (when there is no drop-down) is to keep click “back” to the parent task to open the next subtask.