Exported sure, it's all there. But importing that into your new favorite notes application is not going to be trivial, especially not for regular users.
That's why I've decided to stick mostly to regular files in a filesystem.
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.
Have you actually looked at such an xml: https://gist.github.com/evernotegists/6116886
Exported sure, it's all there. But importing that into your new favorite notes application is not going to be trivial, especially not for regular users.
That's why I've decided to stick mostly to regular files in a filesystem.