Because it’s been addition of new data that is much better than no data I haven’t really taken much issue. But now that you’ve gone in to ‘fix’ the credits and there is dispute, it’s definitely worth weighing in on.
There is no precedent in MB to store everyone involved in a recording in the artist credit field, even if it’s convenient for a user.
Please do feel free to raise votes like this, maybe in Voting/Auto-editor Request Thread