When there are many components at work. Especially when it comes to brainstorming, components are often created and then not used. It would be cool to click on the master component to see if its child versions are used, if so, where exactly
Thats actually a pretty cool idea.
It should also include other documents when the component is distributed via a library.
Would love to to be able to find instances of a component not just in the file the master component is in, but in all files the component has instances in. I use the Instance Finder plugin a lot, but cross-file searching is a limitation.
Also, Sketch had a function that would allow you to step through instances of a component and view the instance before taking action on it, so that you could see overrides and make decisions about those.