I desperately miss the ability to use Siri to update notes. (I've clicked 'Me too' :-)
I seem to remember during the WWDC launch event that Apple said that as of iOS 15, Siri would run on-device. The only explanation I can think of is that Apple never managed to transition all these commands to work on-device in time for the iOS release. So, to us, from one day to the next, they simply stopped working.
What's so annoying is that this important info is deliberately excluded from the release notes. Had we known, we might've waited.
Since watchOS 8, when listening to any audio I can no longer select airplay devices from my watch. (I can select bluetooth devices, just not airplay devices.) I can only imagine this was not ready for launch.
But like other companies who're obsessed with their image, they'd rather suppress anything embarrassing at launch because if the media get their teeth into it, the dent to their reputation is far greater than if it's eventually discovered by users weeks or months afterwards. By this time the media has lost interest. A secondary corporate advantage is that lots of users blindly update to the next release and within a week Apple stops signing the previous OS so it's not possible to downgrade.
People who miss out on missing features are merely collateral who will have to wait for the holes to be filled, if they ever are.
Shoddy and thoughtless. (Maybe that should be Apple's new slogan.)