Very much like the "guix build --dependents" feature!
It was sometimes kind of a painful to do "guix build $(guix refresh --list-dependents | sed ... | awk ... | cut ... | etc.)" to massage the output into something guix build could actually ingest.
Although I do wonder if "guix refresh" could still get a machine readable output format, e.g. one line per package, options for the recursive dependents rather than just the minimum set that would trigger all the builds, etc.