It would be helpful to be able to see a history of edits to an item in Main (like drafts), and to recover old versions of an item.
This would be especially useful for things like Yahoo Mail as a backing store to iPhone Notes: if you accidentally overwrite the contents of a note on your iPhone, you could still get to the content in Yahoo Mail to recover the previous contents.
The principles of "track changes to documents" are well understood thanks to source-control systems, and if there is only one user or lineage on any given item then that simplifies the storage and comparison processes.
NGOZI NANIGI commented
very important as it will benefit others who might have similar Concern