This was such a great way to discover playlists and similar artists based on the artist you are looking at.
I don't see any benefit of removing this feature.
But, the latest update as of now has it removed.
Before, you can go to an artist profile, under the "about section", the right side showed some playlists the artist is featured in (usually the top 5 playlists that this artist has the most plays from).
"Discovered on" should be coming back soon. Take a look here for more info.
With the change of technology throughout the app we need to get this data in a different way, but the intention is to bring it back to Desktop, have it on web for the first time and give it more prominence.