Many non-profits are run by volunteers who don't even know what XML is.
However, CSV or XLS are file formats that everyone can recognise.
XML sometimes (especially WA's exports) treat numbers as letters which means we have to convert to CSV each time to try and run any deeper reporting.
The use case is to have a format that is widely use-able and understandable without us having to take time to convert it (or teach someone to convert it) on our own,
thanks!