I don't do this often, but when I watched the demo that was the only use case that came to mind. Perhaps the author had different motivation to start it, which

I don't do this often, but when I watched the demo that was the only use case that came to mind. Perhaps the author had different motivation to start it, which is why I posted this question — the demo explain what the program does but provide little context other than extracting actual patches, and then again, it begs the question of 'why'.