The problem is if I dont know what guidelines are being used I don’t know what the data represents. So for example the track artist doesnt usually store the composer (unless they are also the performer) for Pop/Rock but it generally would if following Classical guidleines. The trouble is many serious classical users really do not want the composer to be set
as the artist (.e Retrieve Album/CD title using Track Title, Track Artist, Label and Catalog#)
https://wiki.musicbrainz.org/Style/Classical/Track/Artist
so the Hawkes Picard example is the opposite of what is wanted, what they want to do is ‘not set trackartist if from Musicbrainz TrackArtist field if using Classical Guidelines’ which is why a flag would be useful