Let's say that for example I have a lamp with 15 identical screws in it.
I modeled everything, but I realize the 15 screws look bad, so I want to edit them. I want to edit just one of them, and the rest will update accordingly.
The lack of this feature got me frustrated many times, and (being honest) I thought about switching to another software, but I love it too much, so I always made the effort.
So I can already see that, see that new list in the browser named "components".
Best wishes :)
Max.