When Spotify recommends "new" artists to you based on who you have (allegedly) been listening to .. (weird connections, OTM recommends, or "duh" ones)

It's a shame that Spotify only looks at actual listened, I really liked Deezer where you can specifically mark favourite artists and songs (which their heuristics then takes into account). I marked about 100 of my favourite artists and immediately their recommendations were spot on. If I want that info into Spotify I'd have make a playlist with those 100 artists and play that on repeat at night or something.