One can have several hundred notebooks in Evernote.
If one wants to maintain the structure, having exported those notebooks from Evernote into separate ENEX files, one has to import them into Joplin one by one.
It would be very convenient if one could just select several ENEX files in File -> Import -> Evernote Export File (as HTML) dialog box, have them imported into separate Notebooks, as when imported one-by-one.
Of course, “with the cli app you could loop through the files in a bash script and import them all”, as was suggested in May 2021: https:// discourse . joplinapp . org /t/batch-import-multiple-enex-files/17458
However, command-line scripting & debugging may not be in the skillset of an average user. It may be more convenient to employ multiple-file selection in Windows Explorer (or Finder on Mac) that practically any mouse-wielding user is familiar with.