>I don't really remember ever having this smart shuffle thing where Spotify would add their own suggestions to my playlist.

I thought that was always the default behavior unless you paid or something? You find a song you wanna listen to, and then Spotify just spits out a playlist for you, in a Pandora esque radio way where you don't have control over the susequent songs played.

I liked Pandora back in the day, but there was something offputting about how Spotify implemented this. So I never really bothered and made my own playlists.