I think there are many different opinions on 'featuring artists'.
While personally I don't concern myself with it much, I would expect it to be used in a song title, not in the artist tag.
Having 'album artist' as the source to find lyrics also doesn't seem right to me.
Every song will have an artist it is credited to, but not all songs will have an album artist it is credited to.
(singles not on an album, tribute albums with various artists performing songs of another artist, etc.)