Here is another example with the same problem. Philip Glass:
Glass is considered as a composer… so there is not a “Main albums” list, but a “Composed by” list that mixes all the albums, the ones where Glass is a primary artist, but also the ones where someone has played some music by Glass.
I don’t know… it looks like a mess. But at least here i get (i think) all the albums where Glass is composer OR performer. in the case of Horowitz, on the other hand, as he has composed only a few pieces, you loose all the albums where he is “only” a performer.
The moral is: the <1.7 logic where an artist had 2 pages, as performer and as composer, had a reason…