When you click on a component set, the UI will show you which properties are being used and which ones are not. When one isn’t being used it shows an exclamation point. This allows the user to clean up the properties without guesswork.
I would love to see something like this for Local Variables.
As a bonus, I would love to be able to see all of the places a local variable is being used. That way instead of opening each layer, and hunting for a tag, I could maybe see a list of where it’s applied. Like when you use the search function.