Siri killer apps for me are asking for factoids via my watch, and opening my garage door as I approach while driving (my building uses an app that requires multiple taps + swipes to open the garage door, using Siri makes it palatable.)
I haven't bothered yet to add a open/close sensor so the current open state is lost if I use the remote. I have to invert the actions when this happens. Annoying but I only need to use it this way occasionally.
My "integration" with Siri is to set up an iOS shortcut and use Siri to trigger it.