The use case is as follows. Real life example: uploaded a track. Turns out, there was a minor error in the mix and uploaded finalv2 instead of finalv2forreal. Everything's been published and suddenly we find this error. Now we need a new audio file.
Another scenario - feed is published. New band member joins. As part of their deal, they get a minor cut of back catalog. Now we need to update splits (presumably this metadata is saved in the kind zero?).