Thanks for the answers and votes so far.
Here is why I ask: Most my edits so far are removing “feat. xy” from the track title and adding them to the artist credits (I haven’t used pickard yet, but that would be the first thing that would annoy me).
To find releases where the featured artists are credited wrong I don’t just search for “feat.” or “featuring”, but I search for recordings with " feat XY" in their title, where XY is an artist (usually rapper) I know. I then fix it for the whole album and often I know many of the artists, e.g. because they often collaborate with XY too.
Sometimes I don’t know the artist and if there are many entries by that name what usually helps me the most is something like “US rapper”. The further distinction of location doesn’t help me personally as I’m not familiar with US geography.
If there is no entry under the name of the featured artist the number one info that helps me is if the alias is in the disambiguation, because then they still show up as the first result (E.g. the track features “MC XY” and the first result is “Lil’ Z (aka MC XY)”).
By doing what I do I regularly have to add unknown artists without any info. I believe if I did a long research before adding any unknown artist that would slow me down immensely, but I’d probably only find relevant info about the artist in 10% of the times. Until the artist is featured more often or release their own stuff there is just nothing to find.
Adding a disambiguation for any artist (even if there is no other one by the same name) is a great idea I think. I then also like to add the group membership (at least if they did more with the group than solo) so they are found when searching for the group too.