> Have you checked if the users have/need anything (emails, ticket
system, etc.) that refer to specific revisions or the history of
changes made there?   It seems kind of drastic to throw that away
because you think the numbers aren't pretty enough.

But keeping thousands of empty commits in a project they're not relevant to is confusing and wasteful. The  repository and repository URL's for the old project should be preserved, if possible, locked down and read-only, precisely for this kind of change history. But since the repository is being completely refactored *anyway*, it's a great opportunity to discard debris.

Even if the history is considered sacrosanct (and this is often a theological policy, not an engineering one!), an opportunity to reduce the size of each reaporitory by discarding deadwood at switchover time should be taken seriously.