Ability to update recipient signer email address after document is sent
Once a document is created via the API, it is impossible to alter an email address tied to a recipient. In our use cases, it is completely possible that initial email addresses at the time the document is created, have changed before given recipients get around to signing the document.
Christopher Ragland commented
The ability to add another recipient after a document has been sent without having to put the document into draft status and then be sent out and signed by all parties again.