The thing with any 'recommendation' system like Discover Weekly is that while it recommends based on past preferences, the recommendations have the effect of influencing and reinforcing the musical tastes and at some point one will notice that one's taste in music has been entirely manufactured by the algorithm, week by week. This is not just in music, the filtering 'according to preferences' is ubiquitous in today's…
Only 1 (audio analysis) of the 3 models (collaborative, nlp sentiment, audio) doesn't mix in recommendations from non-you sources, thereby surfacing new music to your attention.
It explains why I tend to like Discover too. Precisely because it doesn't duplicate my exact tastes.