Rating songs serves as a sorting method for the user’s music library. In this way, you can sort your songs according to the ones you like the most.
Apple made it easy to use this feature with support for Siri voice commands. Then, users can rate their music even without having to touch their phones. But, this is not working properly now.
Via Andrew Abernathy:
[…] a big loss for me, especially as AFAICT there is no API on iOS for rating songs, so no apps support it. I have a large library, mostly rated, and I use those ratings; I wish Apple hadn’t become so hostile to it.
Previously:
Update (2022-01-03): Tim Hardwick:
Yet reports on Reddit, Apple Support Communities, and the MacRumors forums suggest that the function is not available in iOS 15 or iOS 15.1, and has remained out of action in the latest iOS 15.2 point release, issued in December. Instead of carrying out the request, Siri responds with “I’m Sorry, I’m afraid I can’t do that,” or some variation thereof.
It’s unclear if this is an intended change by Apple, or an intermittent server-side problem that has arisen since the release of iOS 15 , but it’s worth noting that iOS 15 and iOS 15.2 both made functional changes to Siri , in relation to Apple Music interoperability and more generally at the system level.