I listen to Spotify's "Radio based on an Artist" feature everyday and I've noticed within the past few days that only the Artist I select will play on the Radio station, rather than multiple artists similar to whom I've chosen. For example, I was listening to Black Sabbath yesterday and instead of playing similar artists, it was playing songs only from the Black Sabbath catalog. It did the same when I tried a Smashing Pumpkins station. Which is fine, but I can just go to the Artist page and play those songs by turning shuffle on.
The radio was more varied up to a few days ago, so I was wondering if this is a bug or a change that you've made to the algorithm. If the latter, I think people would prefer to have it as it was before, at least I do, because it allowed me to discover new songs/albums by different artists.