This is kind of like asking why one shouldn't run Microsoft Office 2003 anymore. Does it still work? Sure... is it secure and has feature parity with modern of

This is kind of like asking why one shouldn't run Microsoft Office 2003 anymore. Does it still work? Sure... is it secure and has feature parity with modern offerings? Definitely not. Perhaps that's fine - but since LibreOffice is also free and is actively developed (by many of the original OpenOffice team too), I don't see a compelling reason to not make the switch.