This is exactly my issue as well. I’ve posted elsewhere about this and only now I found this thread, so sorry for any duplication.
The very core of the problem imho is that Roon displays Album Artist, not only in Track view, but also in Playlists, while the Track Artist tag is properly set (and I set Roon to prefer file tags).
Wouldn’t it be much more logical to display Track Artist in Track view and in Playlists when the file has the Track artist tag set?