One thing I really like in yum is "yum list extras" - the ability to list packages not found in any online repositories. These are the packages downloaded and installed locally. It's useful to review that list and decide if all those packages are still needed. Specifically if the system is used to build packages distributed to other systems, it's very important to be aware of all installed non-standard packages to avoid dependencies that cannot be satisfied from the standard repository.
If apt-rpm adds support for local packages, it would be very natural to add such command as well.
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