Even in group 1, when I go back to a project that I haven't worked on in years, it would be helpful to be able to query the build system to list the dependencies of a particular artifact, including data dependencies. I.e., reverse dependency lookup. Also list which files could change as a consequence of changing another artifact. And return results based on what the build actually did, not just the rules as specified. I think make can't do this because it has no ability to hash & cache results. Newer build systems like Bazel, Please, and Pants should be able to do this but I haven't used them much yet.
