Not sure how many use SharePoint and metadata?
There has been a toolbar that populates in word and excel when metadata is enabled in a SP document library. It's call the Document Information Panel, it's very user friendly for end users to manipulate the DL's metadata with.
Come to find out MS has "depreciated" the DIP.
This makes me wonder if the developers at MS even use SP and metadata.
If you use SP and metadata take pause before you roll out Office 2016.