In Sorting/Grouping we have the dialogue for how files are grouped into an album.
Could a similar interface be created to define unique Artists
For most users I would think it is probably quite rare to have artists with the exact same name in their library?
And for those occasions and that purpose it's not very difficult to setup some custom tag.
Sure it will demand some effort, but wouldn't having a 'what defines an artist' option, and then setting that up and keeping it working well for your duplicate named artists, demand the same or maybe even more effort?
It's kind off the opposite and yet somewhat similar:
I use something like this to group different artist names together under the same artist name.
So e.g. 'Robert Cray', 'Robert Cray Band', 'The Robert Cray Band' all become the same artist, or, 'Eno & Hyde', 'Eno • Hyde', 'Brian Eno and Karl Hyde' become the same artist, etc.