It highly depends on your field and workflow whether you use the Outliner or not.
I personally do not use Outliner either as I don’t find it useful to my own workflow.
I know @VahePaulman works in relatively same field as I do. I believe the reason is the same.
In architectural projects, you can have hundreds, if not thousands of components and groups. Coming up with clever and unique name for each object is very difficult. And hundreds of objects listed by name on a list would be very difficult to go through.
We work visually. Group#4 and Group#5 is fine for me. I can see them in my model.
I actually don’t “create component”. I make them group first (use G for shortcut) and convert them into components. That way, I don’t get questioned (dialogue)for the name and description of the component.
and that too.
However, I know for a fact that in furniture design and woodworking it is essential to work with it since you can name all the parts.