Add back the ability to add descriptions to the metadata....i.e. capability we had in Power Pivot to add descriptions to columns, tables, measures, etc.
Even just to have something in DAX that could be used to return the description.
In the same way that you can use SELECTEDMEASURENAME() or SELECTEDMEASUREFORMATSTRING() to return the name or the format string of the measure, respectively, you could have something like SELECTEDMEASUREDESCRIPTION() and SELECTEDCOLUMNDESCRIPTION() that returns the description from the metadata. They you could just create a tooltip report that uses this one measure to return the description on mouse-over.
