Ask HN: Spotify Playlist Radio vs. Recommended

I often use the playlist radio feature, which is good. However, if I'm just listening to the playlist and I get to the end, it'll start playing the "recommended" songs in the list at the bottom. I find this algorithm to be superior to radio.

When I look at the songs in playlist radio vs the songs in playlist recommended, there's rarely overlap.

Seems strange that these two features aren't using the same algorithm. Any experiences? Or maybe a dev could chime in?