Siri has gotten a lot better especially at natural language recognition.[1] The HomePod for example is exceptionally good at detecting Hey Siri commands while loud music is playing. That’s all local machine learning processing coupled with a great mic array. It’s more the breadth of services that are the issue, but that’s not machine learning.
The music recs.. well you don’t cite anything. I can say the weekly For You new music mix works good for me.
[1] https://www.cnet.com/news/siri-vs-alexa-vs-google-assistant/