When should git orphaned branches be used?

Question

Git can host multiple DAGs in the same repo with git checkout --orphan command. A frequently cited use case this feature of git is to keep separate a branch for doc

Answer 1

Another use case by the git online documentation:

This can be useful when you want to publish the tree from a commit without exposing its full history. You might want to do this to publish an open source branch of a project whose current tree is "clean", but whose full history contains proprietary or otherwise encumbered bits of code.