As a user, I can remove a specific content unit from Pulp easier
Orphaned content is content which is both, not associated with any RepositoryVersions AND not associated with any Publications. This is here in the code.
As a user, removing a specific piece of content from Pulp is hard. Running orphan cleanup is easy enough, but the hard part is making that content unit an orphan.
The hard question to answer is: "For this content unit: what are the RepositoryVersions that contain it, and what Publications contain it?"