Just to echo Pxtl, but much more explicitly, I don't think this had anything to do with caches or scalability, it was because they bought Songza.
If you've any evidence, please do share and I'm happy to put my hands up and admit I'm wrong, but the announcement was that the change was supposed to be because they now had these amazing hand curated playlists.
> Google looks forward to bringing back those genres/subgenres, and even microgenres, once they've had a chance to improve them and make them more scalable around the world.
If you've any evidence, please do share and I'm happy to put my hands up and admit I'm wrong, but the announcement was that the change was supposed to be because they now had these amazing hand curated playlists.