There are a number of files in XF1 which are no longer required or usable by XF2.
This CLI command will move any known legacy XF1 file into a specially created _legacy directory. From there, you can either archive or remove that directory.
This will not necessarily move all add-on files. It will move any files stored under the old library directory, but other files these add-ons create may still remain. You would have to contact the author of any add-on to check if...
