Presumably "regular users" will not be individually writing XML parsing code to convert the notes. The developers of their "new favorite notes application" will

Presumably "regular users" will not be individually writing XML parsing code to convert the notes. The developers of their "new favorite notes application" will do it (and if they can't be bothered, maybe it shouldn't be your "new favorite notes application"). Joplin, for example, can import notes exported from Evernote. It's just a menu option that even regular users should have no trouble employing.