The ability to specify weekends and holiday through Workspace Administration is terrific. However, we sometimes have different working days for different purposes (e.g., M-F in the office vs. M-Sa at project sites).
It would be terrific if WORKDAYS()/WORKDAYS_DIFF() supported weekend and holiday parameters, similar to WORKDAY.INTL() and NETWORKDAYS.INTL() in Excel and Sheets.
Better still, the holidays parameter could accept a column reference (something like [Holiday Calendar].[Date]) that covers an arbitrary number of years into the past/future.