Earlier quoted context omitted.
i use siri to turn off and on hue lights (sometimes) and sometimes to set reminders. I do feel that since I dont have Siri on an "always on" speaker, it becomes less useful. I dislike the idea of having an "always on" speaker, so I'm not sure what to do. :)
If it makes you feel better, the “always on” recordings never leave your device. They’re not even that great at recognizing anything other than “this sounds like a ‘hey Siri’”.
With Hey Siri turned on, you will reliably get all three words. With it off, you will usually get Chuck or Truck, or sometimes FIRETRUCK depending on timing.
This seems to be for people who start talking before the Siri prompt is fully active like “Set Timer for 5 minutes”.
But shows that Apple is typically pre-recording if not also pre-processing.