> When listening to personalized playlists on Spotify and YouTube Music I skip every single electronic track with vocals. I listen to a lot of techno and related genres, and the moment someone starts singing I skip the track. I've been doing it for years. None of these advanced algorithms have ever noticed this simple pattern.

I think because these platforms have no way to track whether vocals exist as an attribute that can impact recommendations. I wonder if recommendations algorithms are going to training themselves to recognize patterns like this, even in tracks where the producers can't be bothered to participate in a bunch of manual metadata (or can't be honest). Although I would suppose the ongoing cost of having to constantly re-scan everything ever with updates would disincentivize that behavior.