NETWORKDAYS Function
The NETWORKDAYS function in Excel must be one of the most commonly used. This needs to be implemented in BI as it is a fundamental point for analysis for any corporation.
Show when a refresh is in progress
It would be helpful to show when a data source refresh is in progress, along with the % completion.
Grouping/Aliases
It would be great to have the ability to "group" data points and give them an alias. An example would be to group specific customers together to compare to one big customer. This is available in Tableau and should be on Power BI!
Button to Export to Excel
Exporting data from a visual should be much more intuitive for end-users. Adding the ability to "create a button" for this would be amazing rather than having to walk executives through having to hover and click the three dots to export.