Yes, a need to have multiple unrelated line of histories in a single
repository may not be there, even though a desire to do so might
exist. What is done with these unrelated histories that record
unrelated contents [*1*]?
For the record, my use cases are basically subtrees of the project
stashed in submodules instead of being kept as subdirectories in the
main branch (the purpose being to be able to easily share&sync those
subtrees between different projects).
Stefan