I used this earlier this year to split a monorepo into a submodule + 4 other repos. It made it incredibly easy to rewrite history to move files going to differe

I used this earlier this year to split a monorepo into a submodule + 4 other repos. It made it incredibly easy to rewrite history to move files going to different repos, then remove the history of any files not staying in a particular repo. And it was fast. Also, being able to pass in files containing rewrite rules allowed me to easily do multiple dry-runs of the code split ahead of time so I was able to minimize the code freeze for our team.