Similarly, "ScreenTimeAgent" is there even with the feature disabled. AppleMusic and AppleTV daemons scan for caches throughout the day - never opened either. There's also "gamecontrollerd", "studentd", some iMessage and FaceTime related stuff, etc. etc.
And on a system where you've disabled all analytics/tracking, turned off Siri in all places [1], disabled dictation and all other voice input related options, you even keep your microphone muted when it's not in use, even then, "corespeechd" will send out several MBs of data to Apple on every single boot.
Most of this is nothing more than very unexpected and strange behaviour. The exceptions being those 3 apps that keep tripping over themselves, those actually destroying my battery and fans. A little less unintentional obscurity, maybe some official descriptions for these processes, just some communication, that would go a long way.
[1] Siri settings are scattered throughout, a lists exists though: open Preferences > click button "Siri Suggestions & Privacy" > click button "About Siri & Privacy" button > click bu... eh wait click heading "Siri Suggestions" - yes that black print > then, finally, all the places are listed right under where it says "You have choice and control".
