A feature that I’m missing and I think it’s essential is selecting, moving or deleting hierarchies that contain objects with “disable selection in viewport” or disabled viewport visibility.
Currently the only way to do that is to manually select them with shfit+click in the Outliner.
When working with long hierarchies this becomes very tedious.
I think the core of the issue is the way Blender handles viewport visibility and selection (they are somehow connected, in my opinion they shouldn’t be) More about this issue. I know that this is not just an Outliner thing, but the Outliner is where we handle invisible objects or objects with disabled viewport selection.
Also if you try to animate an object’s viewport visibility, the moment it becomes invisible in the viewport the keyframes disappear from the Timeline and the Graph Editor (it gets unselected) and the task becomes a hell.