yeah--but that could be solved with tagging and some basic (toggle-able) filtering capabilities for the thumbnail browser in Music Explorer, e.g. filter out artists that are exclusively tagged as "Guest Artist" or "Remixer." You can currently select that thumbnail browser display "Artist: Artist" which eliminates the "extra" artists, but again, the "Appears On" section doesn't appear in this view.
Just to contextualize why I'm bringing this up: I love the "Appears On" section because it really shows how my library interlaces, but I have roughly 3500 Artists in my library, but only 1300 or so Album Artists. The dilution of the thumbnail browser makes it hard to just browse, basically.