In the first instance, almost all optional plugins are written by someone who needs them. If they are prepared to maintain and enhance them they publish them, hopefully here.
If all programs did everything everyone wanted the software industry would grind to a halt because everything would be already done ��
To deal with most CSV files, such as those from calibre, I find nirsoft's CSVFileView far more useful than spreadsheet programs like excel, calc, and sheets. With it, I don't have to navigate though a zillion features I don't need to do the simple things I do need. It doesn't do arithmetic, so no FFTs on the publication dates of a fractional library
BR