The 'Request Sign-Off' Flow is a great simple out of the box feature to bring the efficiences of Flow to every worker.
However, I had a query from a client recently about the end result. The Sign off status says 'Approved' but there is not indication in a document's metadata as to who signed the document off - That is to say that the 'Modified By' doesn't update to reflect the user who gave sign off. Technically this does make sense as the person who signed-off may not have actually edited the document. But for history purposes it would be good to know who gave signoff in addition to the sign-off status.
There are two ideas here:
1. The first is for MS to add a 'Last Sign-off by' by column in addition to the 'Sign-off status' column.
This means that if the 'Request Sign-Off' Flow is run multiple times on an item the field reflects the last person who gave sign off.
2. Or simply have the Flow update the modfied by field with the Flow approval.