For me this option is great as each user can easily add process to list or library that will help him with approval.
I suggest two updates for this functionality:
1. Possible to track history of runs of this Flow to be able to find some issues in sign-off process
It is great that you can set it such easy. But sometime there is need to find out some history of such sign-offs. To find out what happened.
2. It will great to also have option to remove sign-off from library/list.
I love this user friendly option to activate such functionality so easy. But there are times that you want to provide better, custom developed solution of sign-off process and then it will be nice not to offer this default one.