It’s clear to me that MusicBrainz-website shows the “Recording artist:” in the Tracklist, if the artist credit of a track is different to the artist credit of the recording.
This is okay und it’s easy to see if there are differences.
However, you can not trust this information, it you see the recording artist also sometimes, where it is totally equal to the track artist.
OK, I think, it’s because of the high normalized database.
However, I think it might be good to have different artist credits-records with the same value (name) merged. This shouldn’t be very complicated for an automatic merge. It’s a lot more effort to avoid such duplicates at online-editing.